<PAGE>
                                                                   EXHIBIT 10(b)



                         COMPREHENSIVE SUPPLY AGREEMENT

                  NAVISTAR INTERNATIONAL TRANSPORTATION CORP.
                                      AND
                           CORE MATERIALS CORPORATION

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

 1. LENGTH OF AGREEMENT

    This Agreement between NAVISTAR INTERNATIONAL TRANSPORTATION CORP.
    ("Buyer") and CORE MATERIALS CORPORATION ("Seller") will be for an initial
    term of five (5) years commencing January 1, 1997 and terminating December
    31, 2001 unless otherwise terminated as provided herein.  This Agreement is
    intended to be a rolling five (5) year Agreement where an extension to the
    fifth year is negotiated annually.


 2. PRODUCTS

    A. During the term of this Agreement, provided Seller meets conditions
       in Article 8, Buyer shall purchase from Seller, and Seller shall sell to
       Buyer, one hundred percent (100%) of Buyer's original equipment and
       service requirements for Fiberglass Reinforced Parts using the Sheet
       Molding Compound (SMC) process as they presently exist and are detailed
       in the written specifications, drawings, design and style of Buyer,
       attached hereto as Exhibit A (at their specified prices), or as they may
       be hereafter improved or modified if such improvements and modifications
       are approved by Buyer in writing.

    B. The Buyer agrees to pay the prices as listed in Exhibit A to this
       Agreement as those prices may be amended by other terms in this
       Agreement.

    C. During the term of this Agreement, Seller shall not manufacture or sell
       the Products covered by this Agreement and developed exclusively for
       Buyer to any other party other than Buyer, unless authorized in writing
       by Buyer.


 3. PAYMENT TERMS

    Payment terms shall be [ * ] from date of invoice.

__________________________________

[ * ]  =  CONFIDENTIAL TREATMENT HAS BEEN GRANTED


                                     -27-

<PAGE>
 4. FREIGHT

    A. Seller agrees to use only freight carriers specified in writing by Buyer.

    B. Terms of delivery for all Products sold herein shall be f.o.b. Seller's
       plant.

5. QUALITY

   A. Seller agrees to maintain an acceptable quality system as defined by
      Buyer's corporate requirements published under the title "Navistar
      Quality Requirements", document number GF-333 (NQR).  NQR is comprised of
      two parts: QS-9000, the automotive and truck manufacturers' quality
      system requirements, and NSR, Navistar-specific requirements.  The Seller
      agrees to be QS-9000 registered by January l, 1998.

   B. Part Certification:  Seller further agrees to participate in Buyer's
      product certification program as stated in Buyer's Product Certification
      Manual, GF-604L.

   C. Seller shall provide Product to Buyer which can be applied with paint
      without defects or requiring further processing or repair by Buyer. The
      defects may include dirt, porosity, primer finish defects, molding mars,
      packaging, and other defects similar to the foregoing.  In the event Buyer
      must repair or further process Product for painting, Seller will reimburse
      Buyer at a labor rate of [ * ] per hour.


6. PACKAGING

   A. 1. Seller shall deliver all Products in packaging that
         complies with Buyer's packaging specifications (D13, Rev. 7/94)
         and other special packaging requirements consistent therewith, and
         with previous Agreements between Buyer and Seller.  Buyer is
         responsible for conveying Product packaging specifications to Seller.

      2. Interpretation of packaging specifications and determination of market
         competitive packaging costs will be coordinated between Buyer and
         Seller.

   B.    RETURNABLE CONTAINERS: If returnable containers are required by
         Buyer, container and transportation costs therefor will be negotiated
         in good faith between Buyer and Seller.


__________________________________

[ * ]  =  CONFIDENTIAL TREATMENT HAS BEEN GRANTED


                                     -28-
<PAGE>


 7. SERVICE PARTS AVAILABILITY

    A. Service parts for the Products covered within this Agreement
       will be furnished and combined with production orders.  If Buyer ceases
       production of any product incorporating a Product covered within this
       Agreement, Seller shall continue to maintain tools and supply Buyer with
       the Products necessary to satisfy Buyer's past model service and
       replacement requirements for Buyer's product for a period of at least
       ten (10) years, and at prices to be reasonably agreed to between the
       parties hereto.


    B. In addition, upon termination or expiration of this Agreement,
       Buyer shall have the opportunity for a one-time buy of Products by
       Buyer to fulfill such service and replacement requirements.  Buyer and
       Seller shall negotiate in good faith with respect thereto.


 8. TOOLING

    A. All tooling jigs, fixtures and associated manufacturing equipment
       necessary for the successful production and test of the Products for
       which Buyer pays Seller in full will remain the exclusive property of
       Buyer and Seller assumes all liability for any loss, damage or shortage
       except as caused by Buyer and/or for Seller's failure to return such
       property, including equipment, to Buyer upon request.  Seller shall
       promptly notify Buyer of any such loss, damage or shortage. Such tooling
       items must be identified and labeled as "Owned by Navistar".
       Furthermore, all tooling owned by Buyer shall be used exclusively for
       the manufacture of Products for Buyer. Seller will perform normal
       on-going maintenance, at Seller's expense, in said tooling, jigs,
       fixtures and associated equipment for the duration of this Agreement.
       Buyer further agrees that the costs of replacement of said tooling, jigs
       and fixtures and associated equipment caused by normal use and age of
       these items will be the responsibility of the Buyer.  In addition, Buyer
       agrees that all major tool refurbishment inclusive of, but not limited
       to, re-shear, resurface, re-chrome and rebuild that is a result of
       volume and/or part configuration related tool wear will be funded and
       paid for by the Buyer.

    B. Tooling developed by Seller for the production of the Products will
       conform to Buyer's product development guidelines.  It is expected that
       Seller will exercise due care and judgment in the design, specification
       and building, or supervision of building, of all tooling in such a way
       to maximize production efficiency and minimize cost.  Seller shall
       submit all tools to Buyer for inspection and review by Buyer as defined
       by AIAG Publication, Production Part Approval Process, prior to Buyer
       making payment for the same.  Buyer may, at its option, see detailed
       tooling documents, invoices and/or tooling order prior to issuing its
       approval for payment of tooling.  Tooling costs may be shared with
       Seller or amortized as mutually agreed upon by both parties in writing.
       If Seller pays for tooling and amortizes

                                     -29-
<PAGE>
       cost to Buyer, upon completion of amortization Buyer shall have
       the option to purchase all such tooling from Seller for the price of
       one dollar ($1.00).

 9. NAFTA

    Seller will provide annually to Navistar, by the requested due date, an
    accurate and complete North American Free Trade Agreement (NAFTA)
    Certificate of Origin.  The NAFTA Certificate of Origin must be completed
    in accordance with regulations published by the U.S. Department of the
    Treasury in the Federal Register on December 30, 1993, pages 69460 through
    69565, and any amendments thereto and in accordance with instructions
    issued annually to the Supplier by Navistar.]


10. NEW BUSINESS

    A. EXISTING BUSINESS:  Buyer shall place additional production business of
       Buyer with Seller if, in Buyer's opinion, Seller is competitive in
       price, performance, delivery, reliability, technology or quality with
       other manufacturers of any such products.

    B. NEW PRODUCT DEVELOPMENT:  Both Buyer and Seller shall work together to
       develop designs and processes at target costs that establish the lowest
       possible  cost of any new products. Seller agrees to provide all
       price/cost  submissions with full cost disclosure throughout the
       iterative design  process. Nothing in this Article shall be construed as
       an obligation on the part of Buyer to develop or purchase any products
       other than those Products covered by this Agreement.


11.    ENGINEERING/TECHNICAL SUPPORT

       Seller will provide at no additional cost to Buyer such design and
       design qualification assistance, manufacturing assistance, technical
       and field support as may be reasonably required by Buyer.


12.    WARRANTY

       Seller agrees to warrant its Product for Buyer's heavy duty, medium
       duty and school bus chassis which prove to be defective in material
       and/or workmanship of Seller's Product up to twelve (12) months from new
       vehicle delivery date to user, or 100,000 miles to the extent set forth
       in Article 13.


                                     -30-

<PAGE>

13. REIMBURSEMENT FOR WARRANTY CLAIMS

    Reimbursement for warranty claims costs pursuant to this Article shall
    include one-hundred percent (100%) of the sum of:  (1) material costs at
    Seller's OEM selling price (Seller to Buyer); (2) Buyer's dealer cost
    (Buyer to dealer) times [ * ] percent ([ * ]%); and (3) dealer's normal
    labor charge at the approved rate and time standards approved by Buyer.


14. RIGHTS AND DUTIES

    The rights and duties under this Agreement may be assigned by either
    party, either in whole or in part, only with the prior written consent of
    the other party, which will not be unreasonably withheld.


15. ELECTRONIC DATA INTERCHANGE (EDI) - SCHEDULES AND FORECASTS

    A. Seller agrees to arrange to be in a position to communicate and receive
       all current and future EDI transactions deemed necessary by Buyer
       within twelve months of a consummated transaction.

    B. The parties contemplate that Buyer will communicate production/service
       schedules and releases to Seller, and Seller shall confirm the same to
       Buyer as soon as practicable via electronic data interchange (EDI).  EDI
       is the electronic exchange of routine business transactions (purchase
       orders, material releases, shipping authorizations, shipment
       notifications, etc.).  On not less than a monthly basis, Buyer shall
       issue to Seller a set of communications via EDI.  The EDI
       communications, among other things, shall define Buyer's requirements
       for production/service material as hereinafter provided.

    C. Buyer's Scheduling and Release program will provide weekly regeneration
       of production requirements netted against current available inventory.
       The requirements horizon will be six (6) months, and will contain both
       customer orders and production forecasts.  Furthermore, the six (6)
       month schedule horizon will contain current production requirements
       consisting of twenty (20) daily buckets, eight (8) weekly buckets, one
       (1) balance-of-the-month bucket, and three (3) monthly buckets of
       production requirements.  Buyer's liability for materials shall be
       limited to the requirements shown in the most current six (6) week
       schedule/release, which shall represent a firm commitment for Products,
       except as the parties otherwise agree in writing from time to time with
       regard to specific components which the parties acknowledge require
       additional lead time, and for which parts Buyer shall provide Seller
       with additional lead time in excess of such

__________________________________

[ * ]  =  CONFIDENTIAL TREATMENT HAS BEEN GRANTED


                                     -31-


<PAGE>


       six (6) week firm schedule/release.  The parties contemplate that the
       regenerated schedules will be transmitted weekly via the EDI 830
       transaction set.  In addition, the parties further contemplate that the
       requirements displayed in each new weekly schedule should match very
       closely to the daily requirements which will be transmitted via the EDI
       862 Shipment Authorization.  These schedules will be transmitted weekly
       unless an interim schedule change is required and agreed to in writing
       by the parties.  Seller shall make arrangements to check its EDI mailbox
       on a daily basis.


    D. Additional EDI transactions that will be transmitted weekly, or as
       required, shall include the EDI 856 Shipment Notification and EDI 997
       Functional Acknowledgment.

16. VOLUMES

    Seller and Buyer agree that volumes are based on past usage and
    projected market forecasts.  No minimum quantities of annual production of
    Products or minimum purchase quantities are implied herein, and no
    penalties shall be imposed on Buyer for volumes of Products actually
    ordered by Buyer below those quantities forecasted.


17. INDEMNIFICATION

    Seller indemnifies and holds harmless Buyer and its officers, directors
    and affiliates from any and all damages, costs and expenses incurred as a
    result of a claim by any third party regarding any harm, damage or loss
    incurred (or alleged to have incurred) as a direct result of any defect in
    the materials or workmanship of Seller's Products.  Buyer indemnifies and
    holds harmless Seller and its officers, directors and affiliates from any
    and all damages, costs and expenses incurred as a result of a claim by any
    third party regarding any harm, damage, loss or expense incurred (or
    alleged to have incurred) as a result of Buyer's installation of Seller's
    Products other than as a direct result of any defect in the materials or
    workmanship of Seller's Products.  If a claim is asserted against Buyer and
    Seller, Buyer and Seller shall reasonably cooperate in notifying the
    indemnifying party and shall permit the indemnifying party to conduct the
    defense of such claims at its option.


18. COMPETITIVE CLAUSE

    In the spirit set forth in the recitals of this Agreement, the parties
    recognize that continuing to be competitive in price, performance,
    delivery, reliability, quality and technology is essential for this
    long-term association to exist.  If Buyer reasonably demonstrates to Seller
    that the particular Product part number is not a competitive value in
    price, performance, delivery, reliability, technology and quality with
    other equivalent products of equivalent values, production, usage or
    availability in the world, then Seller

                                     -32-



<PAGE>

    agrees to provide an action plan and timetable within sixty (60) days
    of such demonstration to cure the deficiency.  If the plan fails to cure
    the deficiency within the agreed upon timetable, then Buyer may at its
    option withdraw the non-competitive Product(s) from this Agreement and
    serve notice to terminate the obligations of the parties under this
    Agreement with respect thereto, effective upon the date specified by Buyer
    in such notice.  Buyer agrees that prior to exercising its option, it will
    consider, in good faith, any proposal by Seller to correct the deficiency.



19. REIMBURSEMENT FOR NON-PERFORMANCE BY SELLER

    A. Seller acknowledges that Buyer requires on-time delivery in order to
       operate its plants.  The parties further acknowledge that the precise
       amount of damages which Buyer would sustain in the event Seller were to
       fail to make timely or conforming deliveries of Products would be
       difficult to determine. Therefore, the parties agree that Seller shall
       be responsible for consequential or incidental damages for the
       correction of products assembled out of sequence, as a result of
       delivery delays by Seller that are not due to circumstances beyond its
       control, such as weather, transportation system failures or other acts
       of God, or for the correction of products with quality problems by
       making a payment of $66 per manhour required to correct such problems.
       Any costs Buyer incurs in connection with Buyer's assembly line down
       time caused by failure of Seller to deliver on schedule, for reasons not
       beyond its control but only to the extent that Buyer is not covered by
       business interruption insurance, will be charged at a rate of $700 per
       minute.  Seller will advise Buyer immediately in writing of any apparent
       imminent problem and the parties will mutually use their best efforts to
       avoid any actual assembly line down time.  Seller shall not be
       responsible for the above damages if such out-of-order (late) delivery
       or non-delivery results from a cause beyond Seller's reasonable control
       without fault or negligence, provided that Seller has immediately
       informed Buyer in writing of the problem.  It is expressly understood
       that a failure by Seller to perform resulting from a strike, lockout or
       labor difficulty of Seller shall not be excused, and Seller shall be
       responsible for the above damages, except if Seller complies with
       Article 19-B below.

    B. Seller shall promptly notify Buyer in writing of any anticipated labor
       dispute or labor shortage or any other labor performance interruption,
       and Seller shall arrange for advance deliveries or warehousing, at
       Buyer's option and at locations acceptable to Buyer, of a one month
       supply of Products, which Products shall be limited to those contained
       in the most current six week Scheduling Release (as described in
       Paragraph 15-C herein) or other quantity mutually agreed upon.



                                     -33-
<PAGE>

20. PRICING

    A. Effective with shipments on January 1, 1998, all Product on contract
       will reflect a minimum [ * ] [ * ] percent ([ * ]%) decrease on the
       non-raw material cost components. Furthermore, an additional minimum
       [ * ] percent ([ * ]%) price reduction on the non-raw material cost
       components will become effective on January 1 of each succeeding year
       for the duration of this Agreement.

    B. Seller is required to provide to Buyer audited financial statements,
       including income statements, balance sheets and cash flow, on an annual
       basis.


21. MATERIAL, LABOR AND OVERHEAD

    Labor and overhead costs will be firm, and only raw material
    adjustments will be made for the duration of this Agreement.  Price
    adjustments for raw materials will be based on actual transaction prices
    and must be verified by actual sub-supplier invoices.

    Documentation must be furnished by Seller in writing to Buyer to
    establish the starting base for future requested price adjustments. Seller
    will absorb [ * ] of any raw material price adjustment (increase or
    decrease).  Buyer reserves the right to negotiate and/or purchase raw
    material from other sources for Seller that Buyer proves to be at a lower
    total cost.  Material price adjustments will be subject to annual reviews.
    If a price adjustment is granted by Buyer, then a new price base for raw
    material will be established.


22. PRODUCT IMPROVEMENTS/COST REDUCTION

    Seller and Buyer are committed to an active Product cost reduction
    program.  Any Buyer-initiated cost savings resulting from Product
    improvements and/or design changes shall be credited [ * ] percent ([ * ]%)
    to Buyer.  Mutually developed cost savings resulting from Product/process
    improvements and/or design changes shall be shared [ * ] with Buyer.  Cost
    savings developed solely by Seller shall not affect contract prices.


23. CONFIDENTIAL INFORMATION

    A. During the term of this Agreement, each party may disclose to the other
       certain confidential information relating to the Product(s), the
       application of the Product(s) by Buyer, and business information and
       marketing plans of either party.  Any such information that is marked or
       otherwise clearly identified at the time of disclosure as confidential"
       or "proprietary" shall be considered as Confidential Information for
       purposes of this Agreement, provided that, if the information is


__________________________________

[ * ]  =  CONFIDENTIAL TREATMENT HAS BEEN GRANTED


                                     -34-


<PAGE>

       disclosed orally, a writing identified as "confidential" or
       "proprietary" and summarizing the Confidential Information will be
       provided within thirty (30) days after disclosure.  During the term of
       this Agreement and for a period of five (5) years after the expiration
       or termination of this Agreement, the receiving party will use its best
       efforts to prevent its disclosure of such Confidential Information for
       any purpose other than to effectuate the provisions of this Agreement.
       "Best efforts" with respect to any Confidential Information means at
       least that degree of care normally used by the receiving party to
       prevent disclosure to others of its own confidential information of
       similar importance, but in no case less than a reasonable degree of
       care.  Notwithstanding the foregoing, Seller and Buyer agree that
       Confidential Information shall not include any information which:  (a)
       is or becomes publicly known through no wrongful act on the receiving
       party's part; or (b) is, at the time of disclosure under this Agreement,
       already known to the receiving party without restriction on disclosure;
       or (c) is, or subsequently becomes, rightfully and without breach of
       this Agreement, in the receiving party's possession without any
       obligation restricting disclosure; or (d) is independently developed by
       the receiving party without reference to or use of the Confidential
       Information; or (e) is disclosed pursuant to an order or requirement of
       any governmental or judicial authority, after prior notice to the
       disclosing party respecting such order, and affording the disclosing
       party reasonable cooperation respecting any objections by the disclosing
       party to the request for disclosure, including a reasonable opportunity
       for the disclosing party to obtain a protective order in respect of the
       Confidential Information at the expense of the disclosing party.

    B. Upon request of the disclosing party at any time, the recipient agrees
       to return to the disclosing party or destroy all materials in its
       possession or control which contain Confidential Information of the
       disclosing party, including, without limitations, documents, drawings,
       CAD drawings, computer media, models, prototypes, sketches, designs, and
       lists furnished by the disclosing party or accessed by the recipient,
       including copies thereof made by the recipient, and to delete from its
       computers any software, data files, or CAD files containing Confidential
       Information furnished by the disclosing party.  If materials are
       destroyed, an officer of the recipient shall identify such materials to
       the disclosing party and certify that their destruction has been
       completed. Notwithstanding the foregoing, each party shall be entitled
       to maintain one archival copy of the Confidential Information within its
       Law Department or at the office of its General Counsel, such archival
       copy to be used solely in connection with resolving claims or disputes
       between the parties relating to this Agreement.

    C. This Article 23, Confidential Information, shall survive the termination
       or expiration of this Agreement.


                                     -35-

<PAGE>


24. PATENT, COPYRIGHT AND TRADE SECRET INDEMNITY

    Seller agrees to defend, at its expense, any claim or suit against
    Buyer or Buyer's customers, based on an assertion or claim that a
    Product(s) furnished by Seller to Buyer hereunder or the use or sale by
    Buyer or its customers in the manner contemplated by this Agreement
    infringes any patent, or copyright or is a wrongful use of third-party
    trade secret or proprietary information, and further agrees to indemnify
    and hold Buyer harmless from any cost and expenses, including attorneys'
    fees, settlements associated with said claim or suit, or any damages,
    including attorneys' fees or costs, finally awarded in any such suit,
    provided that Seller is notified promptly in writing of the suit or claim
    and, at Seller's request and expense, is given control of the defense to
    such claim or suit and all reasonable assistance for the defense of same.
    If the use or sale of a Product(s) furnished hereunder is enjoined as a
    result of such suit, Seller, at its option and at no expense to Buyer,
    shall obtain for Buyer and its customers the right to use and sell the
    Product(s) or shall substitute an equivalent Product(s) acceptable to Buyer
    and extend this indemnity thereto.  This indemnity does not extend to any
    claim or suit based on any infringement of any patent by the combination of
    Product(s) furnished by Seller with other components added thereto by
    Buyer, except when the Product(s) is a material part of the invention of an
    asserted patent and the components furnished by Buyer to complete the
    claimed combination, such as an engine, sensor, or vehicle frame, are not
    novel.  This indemnity does not extend to any infringement or alleged
    infringement arising solely out of Seller's compliance with Buyer-required
    specifications, designs, or instructions that (i) are created solely by
    Buyer and (ii) are thereafter furnished to Seller in writing.


25. TERMINATION

    Any termination or expiration of all or part of this Agreement shall not
    relieve either party of obligations incurred pursuant to and during the
    terms of this Agreement, including but not limited to the warranty
    provisions set forth in Article 12 hereof, the indemnification provisions
    set forth in Article 17 hereof, and the "Confidential Information"
    provisions set forth in Article 23 hereof.

    A. TERMINATION FOR DEFAULT:  At any time during the term of this Agreement
       should either party default in performing any of its material
       obligations hereunder, the other party may give written notice of
       default giving the full details thereof.  If the defaulting party fails
       within thirty (30) days of the receipt of written notice of default to
       cure the default, then the non- defaulting party shall have the right to
       terminate this Agreement with regard to the particular Product
       materially affected by the default, or if the default materially affects
       all Products, the non-defaulting party shall have the right to terminate
       this Agreement in its entirety.  The non-defaulting party shall give the
       other party thirty (30) days written notice from the determination of
       the failure to cure the default, whereupon the termination shall be
       effective.


                                     -36-
<PAGE>

    B. TERMINATION FOR INSOLVENCY:  If either party is adjudicated as bankrupt
       or files a voluntary petition in bankruptcy, then, in accordance with
       applicable law, the other party shall have the right to terminate this
       Agreement by giving such financially distressed party thirty (30) days
       written notice from the determination of the bankruptcy to cure the
       bankruptcy, whereupon this Agreement shall automatically terminate.

    C. TERMINATION FOR INADEQUATE QUALITY:  Buyer may terminate this Agreement
       with regard to Products if adequate quality is not maintained in
       accordance with the terms of Article 5 hereof.

    D. TERMINATION FOR FAILURE TO REMAIN COMPETITIVE:  Buyer may terminate this
       Agreement with regard to non-competitive Product in accordance with the
       terms  of Article 18 hereof.

    E. If Force Majeure delays delivery of Products past 15 days, Buyer may
       terminate this Agreement in whole or in part without penalty upon
       written notice to Seller.


26. OTHER CONDITIONS

    This Agreement will also include the terms and conditions as outlined
    on Buyer's contract boilerplate.

27. GOVERNING LAW

    This Agreement shall be governed by and construed in accordance with the
    laws of the State of Ohio.


NAVISTAR INTERNATIONAL
TRANSPORTATION CORP.                  CORE MATERIALS CORPORATION

By: /s/ Thomas M. Hough               By: /s/ Richard R. Conte
    ---------------------                 ----------------------
Name:  Thomas M. Hough                Name: Richard R. Conte
Title: Vice President and             Title: President
Treasurer

December 31, 1996                     December 31, 1996
-------------------------             -------------------------
Date                                  Date




                                     -37-
<PAGE>
                          COLUMBUS PLASTICS OPERATION

                            CURRENT CONTRACT PRICES
<Table>
<Caption>
                                                                                                                 PACKAGING
                                                                                                    ----------------------------
                                                                                                    1996*                  1996*
                                                                                                    SALES                  SALES
LINE                                                                           1995*      1996*     PRICE                  PRICE
NO.    CUSTOMER    DESCRIPTION                                PART NUMBER   QUANTITY   QUANTITY  PER UNIT  PART NUMBER  PER UNIT
<S>    <C>         <C>                                        <C>          <C>        <C>        <C>       <C>          <C>
1      Navistar    AIR DEFL EXT KIT COMPLETE                  1257228R93
2      Navistar    AIR DEFL EXT KIT COMPLETE                  1258056R91
3      Navistar    BATTERY BOX COVER                          1516024C1
4      Navistar    A/D CAB SIDE LT W/TUNNEL COMP              1616854C1
5      Navistar    A/D CAB SIDE RT W/TUNNEL COMP              1616855C1
6      Navistar    9670 AIR DEFL BULK PACK COMP               1617278C1                                    1100047R1
7      Navistar    9670 AIR DEFL BULK PACK COMP               1617279C2                                    1100047R1
8      Navistar    9370 AIR DEFL BULK PACK COMP               1617280C1                                    1100047R1
9      Navistar    LT FENDER EXT EUR/AFR COMPLETE             1619600C3
10     Navistar    RT FENDER EXT EUR/AFR COMPLETE             1619601C3
11     Navistar    9370 AIR DEFLECTOR COMPLETE                1647462C1
12     Navistar    LT SPLASH PNL S-SERIES W/HOLES             1647986C2
13     Navistar    RT SPLASH PNL S-SERIES W/HOLES             1647990C2
14     Navistar    80 x 100 HOOD COMPLETE                     1648017C1                                    1100000R1
15     Navistar    AIR DEFLECTOR CENTER EXT COMP              1649744C1
16     Navistar    AIR DEFLECTOR LEFT EXT COMP                1651622C1
17     Navistar    AIR DEFLECTOR RIGHT EXT COMP               1651623C1
18     Navistar    MEDIUM AIR DEFLECTOR COMP                  1652440C92
19     Navistar    PANEL FILLER LEFT COMPLETE                 1652441C2
20     Navistar    PANEL FILLER RIGHT COMPLETE                1652442C2
21     Navistar    LT SIDE PANEL COMPLETE                     1652443C2
22     Navistar    RT SIDE PANEL COMPLETE                     1652444C2
23     Navistar    LT SIDE PANEL COMPLETE                     1652445C1
24     Navistar    RT SIDE PANEL COMPLETE                     1652446C1
25     Navistar    9670 SUNSHADE COMPLETE                     1652484C1
26     Navistar    9670 AIR DEFLECTOR COMPLETE                1653218C1
27     Navistar    9670 AIR DEFLECTOR COMPLETE                1655015C1
28     Navistar    8300 FRONT ENGINE COVER MOLD               1656783C4
29     Navistar    REAR ENGINE COVER MOLD                     1656787C2
30     Navistar    ENGINE COVER ASSEMBLY REAR                 1656788C92
31     Navistar    FRONT ENGINE COVER MOLD                    1656789C1
32     Navistar    ENGINE COVER ASSEMBLY FRONT                1656790C91
33     Navistar    REAR ENGINE COVER MOLD                     1656791C1
34     Navistar    ENGINE COVER ASSEMBLY REAR                 1656792C91
35     Navistar    46-4900 HOOD SKIN MOLDED                   1657741C1
36     Navistar    46-4900 Lt Fender Ext Complete             1657747C3
37     Navistar    46-4900 Rt Fender Ext Complete             1657748C3
38     Navistar    71-8100 LT FENDER EXT COMPLETE             1657761C4
39     Navistar    71-8100 RT FENDER EXT COMPLETE             1657762C4
40     Navistar    46-4900 LT SPLASH PANEL COMP               1657763C2
41     Navistar    46-4900 RT SPLASH PANEL MOLD               1657764C2
42     Navistar    71-8100 LT SPLASH PANEL MOLD               1657765C2
43     Navistar    71-8100 RT SPLASH PANEL MOLD               1657766C2
44     Navistar    AIR DEFL COVER PLATE COMPLETE              1658122C1
45     GW Fibergla 80 x 112 CENTER REAR REINF                 1658666C1
46     GW Fibergla 80 x 112 CTR. RR. ASS'Y FOR GW             1658666C91
47     GW Fibergla 80 x 112 LEFT REAR REINF                   1658667C2
48     GW Fibergla 80 x 112 RIGHT REAR REINF                  1658668C2
49     GW Fibergla 80 x 112 CENTER REINF                      1658671C2
50     Navistar    80 x 112 HOOD ASSEMBLY COMP                1658675C6
51     Navistar    80 x 90 HOOD COMPLETE                      1658745C1                                    1100003R1
52     Navistar    80 x 100 BTFLY HOOD COMPLETE               1659041C92                                   1100000R1
53     Navistar    90 x 90 HOOD COMPLETE                      1659885C1                                    1100003R1
54     Navistar    46-4900 HOOD COMPLETE                      1660021C1                                    1100064R1
55     Navistar    SCHOOL BUS ENGINE COVER COMP               1660049C2
56     Navistar    71-8100 HOOD COMPLETE                      1661723C1                                    1100058R1
57     Navistar    46-4900 F/Grille Hood Complete             1664204C2                                    1100064R1
58     Navistar    LOWER GRILLE PANEL COMPLETE                1664205C1
59     Navistar    46-4900 HATCH HOOD COMPLETE                1665119C1                                    1100064R1
60     Navistar    ENGINE COVER ASSEMBLY REAR                 1666026C91
61     Navistar    ENGINE COVER COMPLETE                      1666027C1
62     Navistar    9400 AIR DEFLECTOR COMPLETE                1666660C1
63     Navistar    9400 SUNSHADE COMPLETE                     1668583C3
64     Navistar    9700 LT FRONT CAB SKIRT COMP               1668823C2
65     Navistar    9700 RT FRONT CAB SKIRT COMP               1668825C2
66     Navistar    9700 LT SHORT CAB SKIRT COMP               1668827C3
67     Navistar    9700 RT SHORT CAB SKIRT COMP               1668829C3
68     Navistar    9700 LT LONG CAB SKIRT COMP                1668831C3
</Table>

                                     -38-
<PAGE>
<Table>
<Caption>
                                                                                                                 PACKAGING
                                                                                                    ----------------------------
                                                                                                    1996*                  1996*
                                                                                                    SALES                  SALES
LINE                                                                           1995*      1996*     PRICE                  PRICE
NO.    CUSTOMER    DESCRIPTION                                PART NUMBER   QUANTITY   QUANTITY  PER UNIT  PART NUMBER  PER UNIT
<S>    <C>         <C>                                        <C>          <C>        <C>        <C>       <C>          <C>
69     Navistar    9700 RT LONG CAB SKIRT COMP                1668833C3
70     Navistar    COVER BATTERY BOX (S.E.)                   1669645C2
71     Navistar    LT SPLASH PANEL COMPLETE                   1671720C2
72     Navistar    SERVICE GRILLE                             1677510C2
73     Navistar    71-8100 LOWER GRILLE SERVICE               1677511C1
74     Navistar    9370 RH SPLASH PANEL COMPLETE              1688857C1
75     Navistar    THOMAS BUS HOOD COMPLETE                   1688895C92
76     Navistar    UPPER GRILLE PANEL COMPLETE                1689922C1
77     Navistar    80 x 112 HOOD ASM COMP SERVICE             1696070C1                                    1100002R1
78     Navistar    80 x 112 BTFLY HD ASM SERVICE              1696073C91                                   1100002R1
79     Navistar    80 x 112 HOOD ASM COMP SERVICE             1696083C1                                    1100002R1
80     Navistar    80 x 112 OBF BIG HATCH SERVICE             1696085C91                                   1100002R1
81     Navistar    80 x 112 BTFLY HOOD ASSEMBLY               2002001C91                                   1100002R1
82     Navistar    80 x 112 OBF BIG HATCH COMP                2002001C93
83     Navistar    ENGINE COVER, FRONT                        2009847C1
84     Navistar    ENGINE COVER ASSEMBLY                      2009848C91
85     Navistar    COVER, ENGINE - REAR                       2009850C1
86     Navistar    ENGINE COVER ASSEMBLY REAR                 2009851C91
87     Navistar    8200 HOOD 4/RAD ASM COMPLETE               2010717C91
88     Navistar    8100 HOOD W/91L10 PACKAGE                  2012728C91
89     Navistar    WINDSHIELD COWL COMPLETE                   2015306C1
90     Navistar    4500 LH ROUTED FENDER EXT COMP             2015474C1
91     Navistar    4700 LPX LH FENDER ROUTED                  2015474C2
92     Navistar    4500 RH ROUTED FENDER EXT COMP             2015475C1
93     Navistar    4700 LPX RH FENDER ROUTED                  2015475C2
94     Navistar    4500 LH SPLASH PANEL COMP                  2015476C1
95     Navistar    4500 RH SPLASH PANEL COMP                  2015477C1
96     Navistar    8300 SA HOOD ASS'Y COMPLETE                2017424C91
97     Navistar    8200 YF 4/RAD HOOD W/ACC DOOR              2018532C91
98     Navistar    SE BATTERY BOX COVER                       2021637C1
99     Navistar    46-4900 HOOD ASSEMBLY COMP                 2023778C1
100    Navistar    46-4900 F/ GRILLE HOOD ASM COMP            2023784C1
101    Navistar    46-4900 HATCH HOOD ASM COMP                2023786C1
102    Navistar    SE MED DUTY A/D ASSEMBLY COMP              2024955C92                                   1100028R1
103    Navistar    SE LH FILLER PANEL COMPLETE                2024982C1
104    Navistar    SE RH FILLER PANEL COMPLETE                2024983C1
105    Navistar    80 x 112 CAB AIR HOOD ASM COMP             2025663C91
106    Navistar    9370 RT SPLASH PANEL COMPLETE              2025741C2
107    Navistar    FRONT ENGINE COVER ASSEMBLY                2026893C91
108    Navistar    ENGINE COVER ASSEMBLY FRONT                2026894C91
109    Navistar    ENGINE COVER ASSEMBLY REAR                 2026895C91
110    Navistar    ENGINE COVER ASSEMBLY LEVEL 3              2026896C91
111    Navistar    ENGINE  COVER ASSEMBLY LEVEL 1             2026897C1
112    Navistar    ENGINE COVER ASSEMBLY LEVEL 3              2026912C91
113    Navistar    ENGINE COVER ASSEMBLY LEVEL 3              2026913C91
114    Navistar    ENGINE COVER ASSEMBLY LEVEL 3              2026914C91
115    Navistar    ENGINE COVER ASSEMBLY LEVEL 3              2026915C91
116    Navistar    4500 HOOD ASSEMBLY W/LOGO COMP             2030592C91
117    Navistar    LH CAB SKIRT PANEL COMPLETE                2031142C1
118    Navistar    46-4900 HD W/SHUTTER TRIM COMP             2031849C1
119    Navistar    8100 HOOD ASSEMBLY COMPLETE                2033813C91
120    Navistar    8100 HOOD ASM W/CAB AIR COMP               2033814C91
121    Navistar    THOMAS BUS ASM W/O LATCH/LOGO              2034089C91
122    Navistar    LPX LH SPLASH PANEL                        2034763C1
123    Navistar    BATTERY BOX SERVICE COMPLETE               400614C2
124    Navistar    FAN SHROUD COMPLETE                        415824C1
125    Navistar    BATTERY BOX SERVICE MOLD                   415877C2
126    Navistar    BATTERY BOX SERVICE COMPLETE               424704C2
127    Navistar    4070 HEADLIGHT PNL RT COMPLETE             448689C1
128    Navistar    BATTERY BOX PAYSTAR COMPLETE               461568C3
129    GW Fibergla 80 x 112 REINF LT FT VERT ZBAR             483658C2
130    GW Fibergla 80 x 112 REINF RT FT VERT ZBAR             483659C1
131    Navistar    90x90 ENG COV CHEST BOT REAR               492612C2
132    Navistar    90x90 ENG COV CHEST COMP                   492621C2
133    Navistar    FENDER EXTENSION COMPLETE                  499488C2
134    Navistar    FENDER EXTENSION COMPLETE                  499489C2
135    Navistar    BATTERY BOX 9670 CAB OVER COMP             503225C1
136    Navistar    WINDSHIELD COWL COMPLETE                   556644C2
137    Navistar    9370 LT SPLASH PANEL COMPLETE              557488C2
138    Navistar    9370 LT SPLASH PANEL COMPLETE              557489C4
139    Navistar    9370 RT SPLASH PANEL COMPLETE              557490C2
</Table>

                                     -39-
<PAGE>
<Table>
<Caption>
                                                                                                                 PACKAGING
                                                                                                    ----------------------------
                                                                                                    1996*                  1996*
                                                                                                    SALES                  SALES
LINE                                                                           1995*      1996*     PRICE                  PRICE
NO.    CUSTOMER    DESCRIPTION                                PART NUMBER   QUANTITY   QUANTITY  PER UNIT  PART NUMBER  PER UNIT
<S>    <C>         <C>                                        <C>          <C>        <C>        <C>       <C>          <C>
140    Navistar    WINDOW TRIM RING BROWN COMP                557499C2
141    Navistar    WINDOW TRIM RING MOLD                      557499CA
142    Navistar    WINDOW TRIM RING BEIGE COMP                557500C2
143    Navistar    WINDOW TRIM RING BLUE COMP                 557501C2
144    Navistar    A PILLAR LEFT BROWN COMPLETE               557505C1
145    Navistar    A PILLAR RIGHT BROWN COMPLETE              557511C1
146    Navistar    A PILLAR RIGHT BEIGE COMPLETE              557512C1
147                92/9400 HOOD PRODUCT
148    Navistar    9200 HOOD ASS'Y COMPLETE                   3501142C91
149    Navistar    9200 SPLASH PANEL LEFT HAND                3502332C1
150    Navistar    9200 SPLASH PANEL RIGHT HAND               3502336C1
151    Navistar    9400 HOOD ASS'Y COMPLETE                   3501143C91
152    Navistar    92/9400 LH FENDER                          3502350C1
153    Navistar    92/9400 RH FENDER                          3502351C1
154    Navistar    9400 SPLASH PANEL LEFT HAND                3502324C1
155    Navistar    9400 SPLASH PANEL RIGHT HAND               3502328C1

156                HET FLAT FLOOR
157    Navistar    CONSOLE BOX ASSEMBLY                       2041836C91
158    Navistar    CONSOLE BOX ASSEMBLY                       2041838C91
</Table>


* Confidential Treatment Has Been Granted

                                     -40-
<PAGE>
                          COLUMBUS PLASTICS OPERATION

                            CURRENT CONTRACT PRICES
                                                                      Schedule A

                         COLUMBUS PLASTICS OPERATION

                      CURRENT CONTRACT PRICES PACKAGING
<Table>
<Caption>
                                                                                                                 PACKAGING
                                                                                                    ----------------------------
                                                                                                    1996*                  1996*
                                                                                                    SALES                  SALES
LINE                                                                           1995*      1996*     PRICE                  PRICE
NO.    CUSTOMER    DESCRIPTION                                PART NUMBER   QUANTITY   QUANTITY  PER UNIT  PART NUMBER  PER UNIT
<S>    <C>         <C>                                        <C>          <C>        <C>        <C>       <C>          <C>
159                ADDITIONAL ITEMS
160    Navistar    9800 RH Front Cab Skirt                    2032937C1
161    Navistar    9800 RH Short Skirt Assy                   3501623C91
162    Navistar    9800 RH Long Cab Skirt w/Access            3501624C81
163    Navistar    SE Air Deflector Kit                       2042399C91
164    Navistar    8200/2600 Hood Assy Cab Air                350607C91
165    Navistar    8200/2600 Hood Assy Cab                    350714C81
166    Navistar    9400 Splash Panel LH                       3502326C1
167    Navistar    9400 Splash Panel LH Assy                  3502327C1
168    Navistar    9400 Splash Panel RH                       3502330C1
169    Navistar    9400 Splash Panel RH Assy                  3502331C1
170    Navistar    9200 Splash Panel LH                       3502334C1
171    Navistar    9200 Splash Panel LH Assy                  3502335C1
172    Navistar    9200 Splash Panel RH                       3502338C1
173    Navistar    9200 Splash Panel RH Assy                  3502339C1
174    Navistar    46/4900 Headlight Can LH Service           1695909C1
175    Navistar    46/4900 Headlight Can RH Service           1695910C1
176    Navsitar    SE Air Deflector RH Assy                   2042388C1
177    Navistar    A Pillar LH                                557508C1
178    Navistar    A Pillar RH                                557514C1
179    Navistar    8300 Service Crate                         1100907R91
180    Navistar    Sunshade Pack                              1100081R1
181    Navistar    92/9400 Hood Crate Assembly

Line number 94 is deleted and replaced with following:
94     Navistar    4500 LH Splash Panel Comp                  2015476C1
</Table>

*Confidential Treatment Has Been Granted