Document:

<PAGE>
                                                                     EXHIBIT 4.2

                  AGREEMENT OF SUBSTITUTION AND FIRST AMENDMENT
                           TO THE AMENDED AND RESTATED
                          SHAREHOLDERS RIGHTS AGREEMENT

         THIS AGREEMENT (the "First Amendment") is made as of this 5th day of
December, 2002, by and between Plexus Corp. (the "Company") and American Stock
Transfer & Trust Company, a New York banking corporation ("AST").

         WHEREAS, the Company entered into a Shareholder Rights Agreement as of
August 13, 1998, as amended and restated on November 14, 2000 (the "Rights
Agreement"), with Firstar Bank, N.A. (f/k/a Firstar Trust Co.) (the "Predecessor
Rights Agent");

         WHEREAS, the Company and the Rights Agent, if directed by the Company,
may, from time to time, supplement or amend the Rights Agreement pursuant to the
provisions of Section 5.9 of the Rights Agreement;

         WHEREAS, no "Flip in" or "Flip over", Share Acquisition Date or
Distribution Date (as defined in the Rights Agreement) has occurred;

         WHEREAS, the Board of Directors of the Company has desires to remove
the Predecessor Rights Agent and substitute AST as Rights Agent pursuant to
Section 4.5 of the Rights Agreement;

         WHEREAS, the Company has given the Predecessor Rights Agent notice of
removal of the Predecessor Rights Agent and the substitution of AST as the new
Rights Agent under the Rights Agreement;

         WHEREAS, this Amendment complies with the terms of the Rights
Agreement;

         WHEREAS, all acts and things necessary to make this Amendment to the
Rights Agreement a valid, legal, binding instrument of the Company and the
Rights Agreement have been duly done, performed and fulfilled in the execution
and delivery hereof.

         NOW, THEREFORE, the Company and AST hereby agree:

         1. The Company hereby appoints AST as Rights Agent pursuant to Section
4.5 of the Rights Agreement, to serve in that capacity for the consideration and
subject to all the terms and conditions of the Rights Agreement.

         2. AST hereby accepts the appointment as Rights Agent pursuant to
Section 4.5 of the Rights Agreement and agrees to serve in that capacity for the
consideration and subject to all the terms and conditions of the Rights
Agreement.

         3. From and after the date of this Agreement, each and every reference
in the Rights Agreement to the "Rights Agent" shall be deemed to be a reference
to AST.

<PAGE>

         4. The parties agree to amend Section 4.5 of the Rights Agreement to
read as follows:

            4.5 Resignation or Removal of the Rights Agent. The Rights Agent or
         any successor Rights Agent may resign and be discharged from its
         obligations and duties under this Agreement upon 30 days' prior notice
         to the Company and to each transfer agent for the Preferred Shares and
         for the Common Stock of the Company, sent by registered or certified
         mail, postage prepaid, and to each registered holder of the Rights
         Certificates, sent by first-class mail, postage prepaid. The Company
         may remove the Rights Agent or any successor Rights Agent upon 30 days'
         prior notice to the Rights Agent or successor Rights Agent, as the case
         may be, and to each transfer agent for the Preferred Shares and for the
         Common Stock of the Company, sent by registered or certified mail,
         postage prepaid, and to each registered holder of the Rights
         Certificates, sent by first class mail, postage prepaid. If the Rights
         Agent or any successor Rights Agent shall resign or be removed or shall
         otherwise become incapable of acting, the Company shall appoint a
         successor Rights Agent. If the Company shall fail to make such
         appointment within 30 days after giving notice of such removal or after
         receiving notice of such resignation or incapacity, either from the
         resigning or incapacitated Rights Agent or from the registered holder
         of any Rights Certificate (who shall, with such notice, submit its
         Rights Certificate for inspection by the Company), then the incumbent
         Rights Agent or the registered holder of any Rights Certificate may
         apply to any court of competent jurisdiction for the appointment of a
         successor Rights Agent. Any successor Rights Agent, whether appointed
         by the Company or by such a court, shall be a corporation or banking
         institution organized and doing business under the laws of the United
         States of America or the State of Wisconsin or State of New York (or of
         any other state so long as such corporation is authorized to do
         business as a banking institution in the State of Wisconsin), be in
         good standing under the laws of the jurisdiction of its incorporation,
         have an office in the State of Wisconsin, be authorized under such laws
         to exercise corporate trust or stock transfer powers, be subject to
         supervision or examination by federal or state authority and have at
         the time of its appointment as Rights Agent a combined capital and
         surplus of at least $10,000,000. After its appointment, the successor
         Rights Agent shall be vested with the same rights, powers, obligations,
         duties and immunities as if it had been originally named as Rights
         Agent without further act or deed; but the predecessor Rights Agent
         shall deliver and transfer to the successor Rights Agent any property
         at the time held by it hereunder, and execute and deliver any further
         assurance, conveyance, act or deed necessary for the purpose. Not later
         than the effective date of any such appointment, the Company shall file
         notice thereof in writing with the predecessor Rights Agent and each
         transfer agent for the Preferred Shares and for the Common Stock of the
         Company, and mail notice thereof to the registered holders of the
         Rights Certificates. Failure to give any notice provided for in this
         Section, however, or any defect therein, shall not affect the legality
         or validity of the resignation or removal of the Rights Agent or any
         successor Rights Agent or the appointment of any successor thereto.

                                       2
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         5. Pursuant to Section 5.8 of the Rights Agreement, the address for
notices to the Rights Agent shall be as follows:

                        American Stock & Transfer Trust Company
                        59 Maiden Lane
                        New York NY  10038
                        Attn: Corporate Trust Department

         6. This Agreement may be executed in two or more counterparts (by fax
or otherwise) and each of such counterparts shall for all purposes be deemed an
original and all such counterparts together shall constitute one and the same
instrument.

         7. Capitalized terms not defined herein shall, unless the context
otherwise requires, have the meanings assigned to them by such terms in the
Rights Agreement.

         8. If any term, provision, covenant or restriction of this First
Amendment is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions of this First Amendment shall remain in full force
and effect and shall in no way be affected, impaired or invalidated.

         9. This Agreement shall be deemed to be a contract made under the
internal laws of the State of Wisconsin and for all purposes shall be governed
by and construed in accordance with the laws of Wisconsin applicable to
contracts made and to be performed entirely within Wisconsin.

         10. Except to the extent amended hereby, the terms and provisions of
the Rights Agreement are hereby ratified and confirmed.

                           [SIGNATURE PAGE TO FOLLOW]

                                       3
<PAGE>

         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and attested all as of the day and year first written above.

                                       PLEXUS CORP.

                                       By: /s/ Joseph D. Kaufman
                                       Its: Senior Vice President and Secretary

                                       AMERICAN STOCK & TRANSFER COMPANY

                                       By: /s/ Herbert J. Lemmer
                                       Its: Vice President

                                       US BANK, N.A. (f/k/a FIRSTAR BANK,
                                       NA and FIRSTAR TRUST CO.)

                                       By: /s/ John R. Horvath
                                       Its: Vice President

                                       4<PAGE>
                                                                 EXHIBIT 10.4(d)

BY FAX:  414-765-2625

November 6, 2002

Mr. Anthony Maggiore
Director, Capital Markets
Bank One, NA
111 East Wisconsin Ave., 4th Floor
Milwaukee WI 53201

Dear Mr. Maggiore:

In accordance with Section 2.5 (A) of the $250,000,000 Credit Agreement dated as
of October 25, 2000 among Plexus Corp. and the parties thereto as lenders, Bank
One, NA, as administrative agent, ABN Amro Bank N.V. as syndication agent and
Firstar Bank, N.A. as documentation agent (the "Credit Agreement"), this letter
is to request permanent reduction in availability under the Credit Agreement
from $250,000,000 to $150,000,000 effective immediately.

Thank you very much.

Yours truly,

George W.F. Setton
Corporate Treasurer &
Chief Treasury Officer<PAGE>
                                                                EXHIBIT 10.10(f)

                               FIFTH AMENDMENT TO
                         RECEIVABLES PURCHASE AGREEMENT

                  This FIFTH AMENDMENT TO RECEIVABLES PURCHASE AGREEMENT (this
"Amendment") is entered into as of September 30, 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, further amended as of April 25,
2002, and further amended as of June 28, 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.

                                R E C I T A L S:
                                - - - - - - - -

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

<PAGE>

                  "Aggregate Reserves" means, on any date of determination, an
         amount equal to thirty-one percent (31%) 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 or cancelled
         pursuant to this definition, 8.33% of the Net Receivables Balance at
         such time, (b)(i) for Motorola, Inc., 9% of the Net Receivables Balance
         at such time, (ii) for Arrowpoint Communications, Inc. and Cisco
         Systems, Inc., collectively and not individually, 12.50% of the Net
         Receivables Balance at such time, (iii) for General Electric Company,
         25% of the Net Receivables Balance at such time and (iv) for Siemens
         AG, 12.50% of the Net Receivables Balance at such time (each of the
         foregoing, a "Special Obligor Concentration Limit") or (c) for any
         Obligor, such other amount for such Obligor designated by the Agent
         (each such other amount, 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 Obligor Concentration Limit
         or Special Concentration Limit.

                           (c) replacing the definition of "Liquidity
Termination Date" set forth in Exhibit I of the Existing Agreement in its
entirety with the following:

                  "Liquidity Termination Date" means September 26, 2003.

                  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
executed and delivered by each of the parties hereto.

                                                              FIFTH AMENDMENT 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 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, administered and applied in accordance with the terms and provisions
thereof.

                                                              FIFTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT
                                       3

<PAGE>

                           (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) 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)

                                                              FIFTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT
                                       4

<PAGE>

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

                               PLEXUS ABS, INC.

                               By:      /s/
                                  ----------------------------------------------
                               Name:
                                    --------------------------------------------
                               Title:
                                     -------------------------------------------

                               PLEXUS CORP.

                               By:      /s/
                                  ----------------------------------------------
                               Name:
                                    --------------------------------------------
                               Title:
                                     -------------------------------------------

                               PREFERRED RECEIVABLES FUNDING CORPORATION

                               By:      /s/
                                  ----------------------------------------------
                                        Authorized Signer

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

                               By:      /s/
                                  ----------------------------------------------
                               Name:
                                    --------------------------------------------
                               Title:
                                     -------------------------------------------

                                                              FIFTH 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
September 30, 2002, on behalf of the Servicer pursuant to Section 2(b) of the
Fifth 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, further amended as of
April 25, 2002, and further amended as of June 28, 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:

                                                              FIFTH 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
September 30, 2002, on behalf of Seller pursuant to Section 2(b) of the Fifth
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, further amended as of April 25,
2002, and further amended as of June 28, 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:

                                                              FIFTH AMENDMENT TO
                                                  RECEIVABLES PURCHASE AGREEMENT

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