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Exhibit 10(a)
 [*] TEXT OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION
Confidential Treatment Requested by Core Molding Technologies, Inc.
Under 17 C.F.R. Sections 200.80(B)(4), 200.83 and 240.24b-2
 Supply and Management Agreement
 PACCAR Inc
  Purchase and Sale of Products and Parts.
 Purchase of CFG Assets.
 Term of Agreement.
 Pricing.
 
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    Confidential Treatment Requested by Core Molding Technologies, Inc.




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Incremental Business.
 
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    Confidential Treatment Requested by Core Molding Technologies, Inc.




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Most Favored Customer.
 Cost Management Program.
  
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 3




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st
   (i)
    
    Cost reductions to the [*****] or its
tooling that are received after June 10, 2005. All design changes
after June 10, 2005 that impact part or tooling costs will be quoted
using the same quotation form and Core will receive full CMP credit for
any design changes from Cores suggestions that reduce PACCARs costs,
limited to on-site engineering support, tooling price reductions,
weight reductions, material reductions, improvements in plant labor,
handling and line sequencing. The last item on the form will include
the discount offered by Core in their CMP submission.(ii)
    
    Cost reductions resulting from moving
production of [*****] from [*****] to [*****]. In this case, CMP
valuation shall be calculated as the sum of the [*****].(iii)
    
    Price reductions resulting from [*****] plus any repair and maintenance adjustments.
  
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 4




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PACCAR Parts Supplier Guidelines.
 Quality and On-Time Delivery Performance
 3 month rolling average PPM:
    
    
    [*****]On-Time Delivery:
    
    
    [*****]
      Six Sigma Program.
 Payment Terms.
 
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 5




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Set-Off.
 Changes.
 Lead-Time.
   Packing, Marking and Shipping.
     
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 6




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Inspection.
 Returnable Container Program.
 Capacity.
 
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 7




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Movement of Product from the Core Composites Cincinnati Facility.
   Labor Union.
 Strategic Relationship.
   8




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Competitive Requirements.
 Electronic Data Interchange.
 Marketing Assistance.
 Returned Products and Parts.
   
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 9




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Warranty/Recall.
 Indemnification.
  Force Majeure.
 Insurance.
    10




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Intellectual Property.
 Proprietary Rights/Tooling.
 .
 11




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Confidential Information.
 Financial Information.
 Ingredients Disclosure, Special Warnings, and Instructions.
 12




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Termination.
      i.
    
    Core will provide PACCAR with ninety (90) days notice of its
intent to terminate under this subsection (the Notice Period). During the
Notice Period, Core will provide PACCAR with satisfactory documentation of its
revenues and expenses for the relevant period. If Core makes the required
demonstration, then PACCAR may propose measures to permit Core to operate the
facility profitably. If Core declines to implement such measures, then the
parties will agree upon a ninety (90) day Transition Plan, , in the manner set
forth in Section 36, to commence upon the expiration of the Notice Period.ii.
    
    Termination under this provision shall not affect Cores
responsibility to pay any required payments under the terms of its lease of the
Core Composites Cincinnati facility.iii.
    
    In the event of termination under this provision, Core will
relinquish to PACCAR ownership of the assets it acquired from PACCAR under
Section 2 of this Agreement [*****] to PACCAR. In the event that Core
replaces portions of the equipment required for operation, the parties agree to
discuss reimbursement in good faith. Core will not relinquish ownership of
 
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 13




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equipment purchased by Core from sources other than PACCAR (identified with
Core asset tags).
  (i)
    
    the parties will agree upon a ninety (90) day transition plan
to commence upon the expiration of the Notice Period, which will include a
mutually agreed upon inventory bank build to enable PACCAR to transfer
production to other supplier(s) without disruption of its truck manufacturing
schedule.(ii)
    
    PACCAR will reimburse Core for the balance of its lease payments for
the Core Composites Cincinnati facility, and will purchase any remaining raw
material and hardware that Core has purchased to produce the Products
manufactured at Core Composites Cincinnati.
   Transition Period.
     Assignment.
 14




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No Waiver.
 Severability.
 Amendment.
 Duty Drawback Rights.
 Canadian Goods and Services Tax.
 NAFTA.
 Governing Law.
 Jurisdiction and Venue.
 15




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Compliance with Laws and Regulations.
 No Agency Relationship.
 Attorneys Fees.
 Notices.
 If to Core:
    
    If to PACCAR:Core Molding Technologies, Inc.
    
    PACCAR Inc800 Manor Park Drive
    
    777  106th Ave. N. E.P.O. Box 28133
    
    P. O. Box 1518 (98009)Columbus, OH 43228-0183
    
    Bellevue, WA 98004Attention: PACCAR Account Manager
    
    Attention: Director of Purchasing
  Fair Construction.
 Entire Agreement.
 16




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Counterparts.
 Survival.
  Core Molding Technologies, Inc.
    
    
    
    PACCAR IncBy:
    
    /s/ Stephen J. Klestinec
    
    
    
    By:
    
    /s/ T. A. LundahlName: Stephen J. Klestinec
    
    
    
    Name: T. A. LundahlTitle: COO
    
    
    
    Title: VP Purchasing
 17




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SCHEDULES
 Schedule A:
    
    Part Numbers, Description, Raw Material Content, Costs, Surcharges and PriceSchedule B:
    
    PACCAR Assets at the Batavia FacilitySchedule C:
    
    Non-Production Part Numbers, Description, and PriceSchedule D:
    
    PACCAR Parts Supplier GuidelinesSchedule E:
    
    PACCAR Packaging GuidelinesSchedule F:
    
    PACCAR EDI Implementation GuidelineSchedule G:
    
    PACCAR Return Goods GuidelineSchedule H:
    
    PACCAR Parts Return Goods AgreementSchedule I:
    
    PACCAR Core Warranty Support AgreementSchedule J:
    
    PACCAR Tooling Purchase OrderSchedule K:
    
    Non-Disclosure AgreementSchedule L:
    
    Amendment for Additional PACCAR Requirements ([*****])
 
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    Confidential Treatment Requested by Core Molding Technologies, Inc. 18