Document:

<PAGE>
                                                                EXHIBIT 10.2(b)

                      LIMITED WAIVER AND THIRD AMENDMENT TO
                         RECEIVABLES PURCHASE AGREEMENT

                  This LIMITED WAIVER AND THIRD AMENDMENT TO RECEIVABLES
PURCHASE AGREEMENT (this "Waiver and Amendment") is entered into as of April 25,
2002, and amends that certain Receivables Purchase Agreement, dated as of
October 6, 2000, amended as of July 1, 2001 and further amended as of October 3,
2001 (such agreement, as so amended, the "Existing Agreement"), among Plexus
ABS, Inc., a Nevada corporation ("Seller"), Plexus Corp., a Wisconsin
corporation ("Plexus"), as initial Servicer (the Servicer together with Seller,
the "Seller Parties" and each a "Seller Party"), the Financial Institutions
party thereto from time to time, Preferred Receivables Funding Corporation
("PREFCO") and Bank One, NA (Main Office Chicago), as agent for the Purchasers
thereunder and any successor agent thereunder (together with its successors and
assigns thereunder, the "Agent"). Capitalized terms used herein and not
otherwise defined shall have the respective meanings set forth in the Existing
Agreement.

                                    RECITALS:

                  WHEREAS, the Seller Parties, the Financial Institutions,
PREFCO and the Agent are parties to the Existing Agreement;

                  WHEREAS, each Seller Party has requested that the Agent, the
Financial Institutions and PREFCO grant certain waivers with respect to certain
provisions of the Existing Agreement as more fully described herein; and

                  WHEREAS, the Seller Parties, the Financial Institutions,
PREFCO and the Agent desire to amend certain provisions of the Existing
Agreement as more fully described herein.

                  NOW, THEREFORE, in consideration of the premises, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto hereby agree as follows:

                  Section 1. Limited Waiver. Subject to the terms and conditions
set forth herein, each of the Agent, the Financial Institutions and PREFCO
hereby waives the Amortization Event that occurred as of January 31, 2002 with
respect to Section 9.1(f)(ii) of the Existing Agreement solely as a result of
the average of the Open Debit Memo Ratios for the calendar months of November
2001, December 2001 and

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT
<PAGE>

January, 2002 exceeding 5.25%.

                  Section 2. Amendments. Subject to the terms and conditions set
         forth herein, Exhibit I of the Existing Agreement is hereby amended by:

                           (a) replacing the definition of "Aggregate Reserves"
set forth in Exhibit I of the Existing Agreement in its entirety with the
following:

                  "Aggregate Reserves" means, on any date of determination, an
         amount equal to eighteen percent (18%) of the Net Receivables Balance
         on such date.

                           (b) replacing the definition of "Concentration Limit"
set forth in Exhibit I of the Existing Agreement in its entirety with the
following:

                  "Concentration Limit" means, at any time, (a) for any Obligor
         other than as described in part (b) of this definition, 4% of the
         aggregate Outstanding Balance of all Eligible Receivables and (b)(i)
         for Motorola, Inc., 9% of the aggregate Outstanding Balance of all
         Eligible Receivables, (ii) for Arrowpoint Communications, Inc. and
         Cisco Systems, Inc., collectively and not individually, 12% of the
         aggregate Outstanding Balance of all Eligible Receivables, (iii) for
         General Electric Company, 12% of the aggregate Outstanding Balance of
         all Eligible Receivables, (iv) for Siemens AG, 12% of the aggregate
         Outstanding Balance of all Eligible Receivables and (v) for each of the
         foregoing Obligors, such other amount for such Obligor designated by
         the Agent (each of the foregoing, a "Special Concentration Limit");
         provided, that in the case of an Obligor and any Affiliate of such
         Obligor, the Concentration Limit shall be calculated as if such Obligor
         and such Affiliate are one Obligor; and provided, further, that Company
         or the Required Financial Institutions may, upon not less than three
         Business Days' notice to Seller, cancel any Special Concentration
         Limit.

                  Section 3. Conditions to Effectiveness of Waiver and
Amendments. The waiver set forth in Section 1 of this Waiver and Amendment and
the amendments set forth in Section 2 of this Waiver and Amendment shall become
effective as of the date hereof, upon the satisfaction of the following
conditions precedent:

                           (a) Amendment. This Waiver and Amendment shall have
been duly executed and delivered by each of the parties hereto.

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       2
<PAGE>

                           (b) Officer's Certificate. The Agent shall have
received a certificate of an authorized officer of each of the Servicer and
Seller in the forms set forth as Exhibits A and B, respectively, certifying as
to matters set forth in Sections 4(a) and (b) of this Waiver and Amendment.

                           (c) Waiver and Amendment Fee. The Agent shall have
received, in immediately available funds, payment of a fully earned,
non-refundable waiver and amendment fee equal to $35,000.

                  Section 4. Representations and Warranties. Each of Seller and
the Servicer represents and warrants to the Financial Institutions, PREFCO and
the Agent that, as of the date hereof, and after giving effect to the waiver set
forth in Section 1 of this Waiver and Amendment and the amendments set forth in
Section 2 of this Waiver and Amendment:

                           (a) no Amortization Event or Potential Amortization
Event has occurred and is continuing; and

                           (b) all of the representations and warranties
contained in the Existing Agreement, as waived and amended by this Waiver and
Amendment, and in the other Transaction Documents are true and correct.

                  Section 5. Miscellaneous.

                           (a) Effect; Ratification. The waiver and amendments
set forth herein are effective solely for the purposes set forth herein and
shall be limited precisely as written, and shall not be deemed to (i) be a
consent to any amendment, waiver or modification of any other term or condition
of the Existing Agreement or of any other instrument or agreement referred to
therein; or (ii) prejudice any right or remedy which the Financial Institutions,
PREFCO or the Agent may now have or may have in the future under or in
connection with the Existing Agreement, as amended hereby, or any other
instrument or agreement referred to therein. Each reference in the Existing
Agreement to "this Agreement," "herein," "hereof" and words of like import and
each reference in the other Transaction Documents to the "Receivables Purchase
Agreement," the "Purchase Agreement" or the Existing Agreement shall mean the
Existing Agreement as amended hereby. This Waiver and Amendment shall be
construed in connection with and as part of the Existing Agreement and all
terms, conditions, representations, warranties, covenants and agreements set
forth in the Existing Agreement and each other instrument or

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       3
<PAGE>

agreement referred to therein, except as herein waived or amended, are hereby
ratified and confirmed and shall remain in full force and effect.

                           (b) Transaction Documents. This Waiver and Amendment
is a Transaction Document executed pursuant to the Existing Agreement and shall
be construed, administered and applied in accordance with the terms and
provisions thereof.

                           (c) Costs, Fees and Expenses. Seller agrees to
reimburse the Agent and each Purchaser on demand for all costs, fees and
expenses (including the reasonable fees and expenses of counsel to the Agent and
the Purchasers) incurred in connection with the preparation, execution and
delivery of this Waiver and Amendment.

                           (d) Counterparts. This Waiver and Amendment may be
executed in any number of counterparts, each such counterpart constituting an
original and all of which when taken together shall constitute one and the same
instrument.

                           (e) Severability. Any provision contained in this
Waiver and Amendment which is held to be inoperative, unenforceable or invalid
in any jurisdiction shall, as to that jurisdiction, be inoperative,
unenforceable or invalid without affecting the remaining provisions of this
Waiver and Amendment in that jurisdiction or the operation, enforceability or
validity of such provision in any other jurisdiction.

                           (f) GOVERNING LAW. THIS WAIVER AND AMENDMENT SHALL BE
GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE
STATE OF ILLINOIS.

                            (Signature Page Follows)

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       4
<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have executed this
Waiver and Amendment as of the date first written above.

                             PLEXUS ABS, INC.

                             By:
                                -----------------------------------------------
                             Name:
                                  ---------------------------------------------
                             Title:
                                   --------------------------------------------

                             PLEXUS CORP.

                             By:
                                -----------------------------------------------
                             Name:
                                  ---------------------------------------------
                             Title:
                                   --------------------------------------------

                             PREFERRED RECEIVABLES FUNDING CORPORATION

                             By:
                                -----------------------------------------------
                                      Authorized Signatory

                             BANK ONE, NA (MAIN OFFICE CHICAGO), as a Financial
                             Institution and as Agent

                             By:
                                -----------------------------------------------
                             Name:
                                  ---------------------------------------------
                             Title:
                                   --------------------------------------------

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                      S-1
<PAGE>

                                                                       EXHIBIT A

                              OFFICER'S CERTIFICATE

                  I, ______________, am the _______________ of Plexus Corp. (the
"Servicer"). I execute and deliver this Officer's Certificate, dated as of April
25, 2002, on behalf of the Servicer pursuant to Section 3(b) of the Waiver and
Third Amendment to Receivables Purchase Agreement (the "Waiver and Amendment"),
dated as of the date hereof, among the Seller Parties, the Financial
Institutions, PREFCO and the Agent (each as defined therein), amending certain
provisions of that certain Receivables Purchase Agreement, dated as of October
6, 2000, amended as of July 1, 2001 and further amended as of October 3, 2001
(such agreement, as so amended, the "Existing Agreement"), among the Seller
Parties, the Financial Institutions, PREFCO and the Agent. Capitalized terms
used herein and not defined herein shall have the meanings set forth for such
terms in the Existing Agreement.

                  I hereby certify, on behalf of the Servicer, that to the best
of my knowledge after due inquiry, as of the date hereof, and after giving
effect to the waiver set forth in Section 1 of the Waiver and Amendment and the
amendments set forth in Section 2 of the Waiver and Amendment, (a) no
Amortization Event or Potential Amortization Event has occurred and is
continuing and (b) the representations and warranties of Seller and the Servicer
contained in the Existing Agreement, as waived and amended by the Waiver and
Amendment, and in the other Transaction Documents are true and correct as of the
date hereof.

                                            ----------------------------------
                                            Name:
                                            Title:

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT
<PAGE>

                                                                       EXHIBIT B

                              OFFICER'S CERTIFICATE

                  I, ______________, am the _______________ of Plexus ABS, Inc.
("Seller"). I execute and deliver this Officer's Certificate, dated as of April
25, 2002, on behalf of Seller pursuant to Section 3(b) of the Waiver and Third
Amendment to Receivables Purchase Agreement (the "Waiver and Amendment"), dated
as of the date hereof, among the Seller Parties, the Financial Institutions,
PREFCO and the Agent (each as defined therein), amending certain provisions of
that certain Receivables Purchase Agreement, dated as of October 6, 2000,
amended as of July 1, 2001 and further amended as of October 3, 2001 (such
agreement, as so amended, the "Existing Agreement"), among the Seller Parties,
the Financial Institutions, PREFCO and the Agent. Capitalized terms used herein
and not defined herein shall have the meanings set forth for such terms in the
Existing Agreement.

                  I hereby certify, on behalf of Seller, that to the best of my
knowledge after due inquiry, as of the date hereof, and after giving effect to
the waiver set forth in Section 1 of the Waiver and Amendment and the amendments
set forth in Section 2 of the Waiver and Amendment, (a) no Amortization Event or
Potential Amortization Event has occurred and is continuing and (b) the
representations and warranties of Seller contained in the Existing Agreement, as
waived and amended by the Waiver and Amendment, and in the other Transaction
Documents are true and correct as of the date hereof.

                                            ----------------------------------
                                            Name:
                                            Title:

                                           LIMITED WAIVER AND AMENDMENT NO. 3 TO
                                                  RECEIVABLES PURCHASE AGREEMENT<PAGE>
                                                                EXHIBIT 10.2(c)

                               FOURTH AMENDMENT TO
                         RECEIVABLES PURCHASE AGREEMENT

                  This FOURTH AMENDMENT TO RECEIVABLES PURCHASE AGREEMENT (this
"Amendment") is entered into as of June 28, 2002, and amends that certain
Receivables Purchase Agreement, dated as of October 6, 2000, amended as of July
1, 2001, further amended as of October 3, 2001, and further amended as of April
25, 2002 (such agreement, as so amended, the "Existing Agreement"), by and among
Plexus ABS, Inc., a Nevada corporation ("Seller"), Plexus Corp., a Wisconsin
corporation ("Plexus"), as initial Servicer (the Servicer together with Seller,
the "Seller Parties" and each a "Seller Party"), the Financial Institutions
party thereto from time to time, Preferred Receivables Funding Corporation
("PREFCO") and Bank One, NA (Main Office Chicago), as agent for the Purchasers
thereunder and any successor agent thereunder (together with its successors and
assigns thereunder, the "Agent"). Capitalized terms used herein and not
otherwise defined shall have the respective meanings set forth in the Existing
Agreement.

                                    RECITALS:

                  WHEREAS, the Seller Parties, the Financial Institutions,
PREFCO and the Agent are parties to the Existing Agreement; and

                  WHEREAS, the Seller Parties, the Financial Institutions,
PREFCO and the Agent desire to amend certain provisions of the Existing
Agreement as more fully described herein.

                  NOW, THEREFORE, in consideration of the premises, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto hereby agree as follows:

                  Section 1. Amendments. Subject to the terms and conditions set
forth herein, the Existing Agreement is hereby amended by:

                           (a) adding the following new subsection to the end of
Section 7.2 of the Existing Agreement:

                           (h) Collections. No Seller Party will deposit or
         otherwise credit, or cause or permit to be so deposited or credited, to
         any Lock Box, Plexus Account or Designated Account cash, cash proceeds
         or other amounts, other than Collections. Except as may be

<PAGE>

         required pursuant to the last sentence of Section 8.2(b), no Seller
         Party will deposit or otherwise credit, or cause or permit to be so
         deposited or credited, any Collections or proceeds thereof to any
         lock-box account or other account other than a Plexus Account or a
         Designated Account, as applicable.

                           (b) adding the following two new definitions to
Exhibit I to the Existing Agreement in proper alphabetical order:

                  "Excluded Receivable" means all indebtedness and other
         obligations owed to Originator or in which Originator has a security
         interest or other interest (including, without limitation, any
         indebtedness, obligation or interest constituting an account, chattel
         paper, instrument or general intangible) arising in connection with the
         sale of goods or the rendering of services by Originator to an Excluded
         Obligor, and further includes, without limitation, the obligation to
         pay any finance charges, interest, late payment charges or similar
         charges with respect thereto. Indebtedness and other rights and
         obligations arising from any one transaction, including, without
         limitation, indebtedness and other rights and obligations represented
         by an individual invoice, shall constitute an Excluded Receivable
         separate from an Excluded Receivable consisting of the indebtedness and
         other rights and obligations arising from any other transaction;
         provided, that any indebtedness, rights or obligations referred to in
         the immediately preceding sentence shall be an Excluded Receivable
         regardless of whether the account debtor or Originator treats such
         indebtedness, rights or obligations as a separate payment obligation.

                  "Excluded Obligor" means Honeywell-Aerospace Electronic
         Systems, a division of Honeywell International Inc..

                           (c) adding the proviso "; provided that 'Receivable'
shall not include any Excluded Receivable" to the end of the first sentence of
the definition of "Receivable" in Exhibit I of the Existing Agreement.

                  Section 2. Conditions to Effectiveness of Amendments. The
amendments set forth in Section 1 of this Amendment shall become effective as of
the date hereof, upon the satisfaction of the following conditions precedent:

                           (a) Amendment. This Amendment shall have been duly

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       2
<PAGE>

executed and delivered by each of the parties hereto.

                           (b) Officer's Certificate. The Agent shall have
received a certificate of an authorized officer of each of the Servicer and
Seller in the forms set forth as Exhibits A and B, respectively, certifying as
to matters set forth in Sections 3(a) and (b) of this Amendment.

                  Section 3. Representations and Warranties. Each of Seller and
the Servicer represents and warrants to the Financial Institutions, PREFCO and
the Agent that, as of the date hereof, both before and after giving effect to
the amendments set forth in Section 1 of this Amendment:

                           (a) no Amortization Event or Potential Amortization
Event has occurred and is continuing; and

                           (b) all of the representations and warranties
contained in the Existing Agreement and in the other Transaction Documents are
true and correct.

                  Section 4. Miscellaneous.

                           (a) Effect; Ratification. The amendments set forth
herein are effective solely for the purposes set forth herein and shall be
limited precisely as written, and shall not be deemed to (i) be a consent to any
amendment, waiver or modification of any other term or condition of the Existing
Agreement or of any other instrument or agreement referred to therein; or (ii)
prejudice any right or remedy which the Financial Institutions, PREFCO or the
Agent may now have or may have in the future under or in connection with the
Existing Agreement, as amended hereby, or any other instrument or agreement
referred to therein. Each reference in the Existing Agreement to "this
Agreement," "herein," "hereof" and words of like import and each reference in
the other Transaction Documents to the "Receivables Purchase Agreement," the
"Purchase Agreement" or the Existing Agreement shall mean the Existing Agreement
as amended hereby. This Amendment shall be construed in connection with and as
part of the Existing Agreement and all terms, conditions, representations,
warranties, covenants and agreements set forth in the Existing Agreement and
each other instrument or agreement referred to therein, except as herein
amended, are hereby ratified and confirmed and shall remain in full force and
effect.

                           (b) Transaction Documents. This Amendment is a
Transaction Document executed pursuant to the Existing Agreement and shall be
construed,

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       3
<PAGE>

administered and applied in accordance with the terms and provisions thereof.

                           (c) Costs, Fees and Expenses. Seller agrees to
reimburse the Agent and each Purchaser on demand for all costs, fees and
expenses (including the reasonable fees and expenses of counsel to the Agent and
the Purchasers) incurred in connection with the preparation, execution and
delivery of this Amendment.

                           (d) Counterparts. This Amendment may be executed in
any number of counterparts, each such counterpart constituting an original and
all of which when taken together shall constitute one and the same instrument.

                           (e) Severability. Any provision contained in this
Amendment which is held to be inoperative, unenforceable or invalid in any
jurisdiction shall, as to that jurisdiction, be inoperative, unenforceable or
invalid without affecting the remaining provisions of this Amendment in that
jurisdiction or the operation, enforceability or validity of such provision in
any other jurisdiction.

                           (f) Amendment to Receivables Sale Agreement. The
Agent, by its execution hereof, consents to Seller's execution and delivery of
the First Amendment to Amended and Restated Receivables Sale Agreement, dated as
of the date hereof and in the form of Exhibit C hereto, by and among Seller and
Originator. The Agent deems this paragraph to constitute its prior written
consent to Seller's execution of such amendment and deems this paragraph to
satisfy the requirements of Section 7.1(i)(N) of the Existing Agreement.

                           (g) Confirmation of Ownership and/or Security
Interest. Seller hereby confirms (i) the sale and assignment of Purchaser
Interests pursuant to Sections 1.1 and/or 1.2 of the Existing Agreement and (ii)
the grant of security interest pursuant to Section 14.14(b) of the Existing
Agreement to the Agent for the ratable benefit of the Purchasers in all of
Seller's right, title and interest in, to and under all Receivables, the
Collections, each Lock-Box, all Related Security, all other rights and payments
relating to such Receivables, and all proceeds of any thereof (each capitalized
term used in this sentence shall have the respective meanings set forth for such
term in the Existing Agreement, as amended hereby).

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       4
<PAGE>

                           (h) GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED
BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
ILLINOIS.

                            (Signature Page Follows)

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT

                                       5
<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have executed this
Amendment as of the date first written above.

                            PLEXUS ABS, INC.

                            By:
                               -----------------------------------------------
                            Name:
                                 ---------------------------------------------
                            Title:
                                  --------------------------------------------

                            PLEXUS CORP.

                            By:
                               -----------------------------------------------
                            Name:
                                 ---------------------------------------------
                            Title:
                                  --------------------------------------------

                            PREFERRED RECEIVABLES FUNDING CORPORATION

                            By:
                               -----------------------------------------------
                                     Authorized Signer

                            BANK ONE, NA (MAIN OFFICE CHICAGO), as a Financial
                            Institution and as Agent

                            By:
                               -----------------------------------------------
                            Name:
                                 ---------------------------------------------
                            Title:
                                  --------------------------------------------

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT
<PAGE>

                                                                       EXHIBIT A

                              OFFICER'S CERTIFICATE

                  I, ______________, am the _______________ of Plexus Corp. (the
"Servicer"). I execute and deliver this Officer's Certificate, dated as of June
28, 2002, on behalf of the Servicer pursuant to Section 2(b) of the Fourth
Amendment to Receivables Purchase Agreement (the "Amendment"), dated as of the
date hereof, among the Seller Parties, the Financial Institutions, PREFCO and
the Agent (each as defined therein), amending certain provisions of that certain
Receivables Purchase Agreement, dated as of October 6, 2000, amended as of July
1, 2001, further amended as of October 3, 2001, and further amended as of April
25, 2002 (such agreement, as so amended, the "Existing Agreement"), among the
Seller Parties, the Financial Institutions, PREFCO and the Agent. Capitalized
terms used herein and not defined herein shall have the meanings set forth for
such terms in the Existing Agreement.

                  I hereby certify, on behalf of the Servicer, that to the best
of my knowledge after due inquiry, as of the date hereof, both before and after
giving effect to the amendments set forth in Section 1 of the Amendment, (a) no
Amortization Event or Potential Amortization Event has occurred and is
continuing and (b) the representations and warranties of Seller and the Servicer
contained in the Existing Agreement and in the other Transaction Documents are
true and correct as of the date hereof.

                                            ----------------------------------
                                            Name:
                                            Title:

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT
<PAGE>

                                                                       EXHIBIT B

                              OFFICER'S CERTIFICATE

                  I, ______________, am the _______________ of Plexus ABS, Inc.
("Seller"). I execute and deliver this Officer's Certificate, dated as of June
28, 2002, on behalf of Seller pursuant to Section 2(b) of the Fourth Amendment
to Receivables Purchase Agreement (the "Amendment"), dated as of the date
hereof, among the Seller Parties, the Financial Institutions, PREFCO and the
Agent (each as defined therein), amending certain provisions of that certain
Receivables Purchase Agreement, dated as of October 6, 2000, amended as of July
1, 2001, further amended as of October 3, 2001 and further amended as of April
25, 2002 (such agreement, as so amended, the "Existing Agreement"), among the
Seller Parties, the Financial Institutions, PREFCO and the Agent. Capitalized
terms used herein and not defined herein shall have the meanings set forth for
such terms in the Existing Agreement.

                  I hereby certify, on behalf of Seller, that to the best of my
knowledge after due inquiry, as of the date hereof, both before and after giving
effect to the amendments set forth in Section 1 of the Amendment, (a) no
Amortization Event or Potential Amortization Event has occurred and is
continuing and (b) the representations and warranties of Seller contained in the
Existing Agreement and in the other Transaction Documents are true and correct
as of the date hereof.

                                            ----------------------------------
                                            Name:
                                            Title:

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT
<PAGE>

                                                                       EXHIBIT C

                                     FORM OF
       FIRST AMENDMENT TO AMENDED AND RESTATED RECEIVABLES SALE AGREEMENT

                                  See Attached

                                                             FOURTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT

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