Document:

<PAGE>   1
                                                                 EXHIBIT 4(a)(8)

                  SEVENTH AMENDMENT TO NOTE PURCHASE AGREEMENT
                                       RE:
                          CREDIT ACCEPTANCE CORPORATION
                           SECOND AMENDED AND RESTATED
                    10.37% SENIOR NOTES DUE NOVEMBER 1, 2001

                                                Dated as of April 27, 2000
                                                Effective as of December 1, 1999

To the Noteholders listed on Annex I hereto

Ladies and Gentlemen:

     Credit Acceptance Corporation, a Michigan corporation (together with its
successors and assigns, the "Company"), hereby agrees with you as follows:

SECTION 1. INTRODUCTORY MATTERS.

     1.1 DESCRIPTION OF OUTSTANDING NOTES. The Company currently has outstanding
its Second Amended and Restated 10.37% Senior Notes due July 1, 2001
(collectively, the "Notes") which it issued pursuant to the separate Note
Purchase Agreements, each dated as of October 1, 1994 (collectively, as amended
by the First Amendment to Note Purchase Agreement, dated as of November 15,
1995, the Second Amendment to Note Purchase Agreement, dated as of August 29,
1996, the Third Amendment to Note Purchase Agreement, dated as of December 12,
1997, the Fourth Amendment to Note Purchase Agreement, dated as of July 1, 1998,
the Fifth Amendment to Note Purchase Agreement, dated as of April 13, 1999, and
the Sixth Amendment, dated as of December 1, 1999, the "Agreement"), entered
into by the Company with each of the original holders of the Notes listed on
Annex 1 thereto, respectively. Terms used herein but not otherwise defined
herein shall have the meanings assigned thereto in the Agreement, as amended
hereby.

     1.2 PURPOSE OF AMENDMENT. The Company and you desire to amend the Agreement
as set forth in Section 2 hereof.

SECTION 2. AMENDMENT TO THE AGREEMENT.

     Pursuant to Section 10.5 of the Agreement, the Company hereby agrees with
you that the Agreement shall be amended by this Seventh Amendment to Note
Purchase Agreement (this "Seventh Amendment") in the following respect:

     2.1 SECTION 6.1(B). Clause (i) of Section 6.1(b) is hereby amended in its
entirety as follows:

<PAGE>   2

                                                                 EXHIBIT 4(a)(8)

               (i) two hundred percent (200%) of Consolidated Tangible Net Worth
          at such time, provided that for purposes of this test, Consolidated
          Senior Funded Debt shall be calculated by including all Debt incurred
          by a Special Purpose Subsidiary, whether or not included therein under
          GAAP, or

     2.2 SECTION 6.1(C). Section 6.1(c) is hereby amended in its entirety as
follows:

               (C) SUBORDINATED FUNDED DEBT. The Company will not at any time
          permit Consolidated Subordinated Funded Debt to exceed one hundred
          fifty percent (150%) of Consolidated Tangible Net Worth at such time,
          provided that for purposes of this test, Consolidated Subordinated
          Funded Debt shall be calculated by including all Debt incurred by a
          Special Purpose Subsidiary, whether or not included therein under
          GAAP.

     2.3 SECTION 9.1. The definition of Consolidated Tangible Net Worth in
Section 9.1 is hereby amended and restated in its entirety as set forth below.

     CONSOLIDATED TANGIBLE NET WORTH -- means, at any time, the result of

          (a)  the shareholders' equity of the Company and its Subsidiaries,
               minus

          (b)  the retained earnings of the Unrestricted Subsidiaries, minus

          (c)  all Intangible Assets of the Company and the Subsidiaries, minus

          (d)  without duplication, any excess servicing asset resulting from
               the Transfer, pursuant to a Permitted Securitization, of
               Advances, Leased Vehicles, Installment Contracts (whether
               assigned outright or related to Advances) or Leases (whether
               assigned outright or related to Leased Vehicles),

in each case as would be reflected on a consolidated balance sheet of such
Persons at such time. As used in this definition, "Consolidated Net Worth"
means, at any time, the amount of "consolidated total assets" less the amount of
"consolidated total liabilities", as each would be reflected on a consolidated
balance sheet of the Company and its Subsidiaries at such time, prepared in
accordance with GAAP.

SECTION 3. MISCELLANEOUS

     3.1 COUNTERPARTS. This Seventh Amendment may be executed in any number of
counterparts, each executed counterpart constituting an original, but all
together only one Seventh Amendment.

                                       2

<PAGE>   3

                                                                 EXHIBIT 4(a)(8)

     3.2 HEADINGS. The headings of the sections of this Seventh Amendment are
for purposes of convenience only and shall not be construed to affect the
meaning or construction of any of the provisions hereof.

     3.3 GOVERNING LAW. This Seventh Amendment shall be governed by and
construed in accordance with the internal laws of the State of Connecticut.

     3.4 EFFECT OF AMENDMENT. Except as expressly provided herein (a) no other
terms and provisions of the Agreement shall be modified or changed by this
Seventh Amendment and (b) the terms and provisions of the Agreement, as amended
by this Seventh Amendment, shall continue in full force and effect. The Company
hereby acknowledges and reaffirms all of its obligations and duties under the
Agreement, as modified by this Seventh Amendment, and the Notes.

     3.5 REFERENCES TO THE AGREEMENT. Any and all notices, requests,
certificates and other instruments executed and delivered concurrently with or
after the execution of the Seventh Amendment may refer to the Agreement without
making specific reference to this Seventh Amendment but nevertheless all such
references shall be deemed to include, to the extent applicable, this Seventh
Amendment unless the context shall otherwise require.

     3.6 COMPLIANCE. The Company certifies that immediately before and after
giving effect to this Seventh Amendment, no Default or Event of Default exists
or would exist after giving effect hereto; provided that the Company is not in
compliance with the covenant contained in Section 6.3 before giving effect to
this Seventh Amendment.

     3.7 EFFECTIVENESS OF AMENDMENTS. The amendments to the Agreement
contemplated by Section 2 hereof shall (in accordance with Section 10.5(a) of
the Agreement) become effective (retroactive to December 1, 1999), if at all, at
such time as the Company and the Required Holders of the Notes shall have
indicated their written consent to such amendments by executing and delivering
the applicable counterparts of this Seventh Amendment. It is understood that any
holder of Notes may withhold its consent for any reason, including, without
limitation, any failure of the Company to satisfy all of the following
conditions:

          (a) This Seventh Amendment shall have been executed and delivered by
     the Company and each of the Required Holders of the Notes.

          (b) The execution, delivery and effectiveness of an agreement, signed
     by the Company and the requisite holders of the Company's Second Amended
     and Restated 9.49% Senior Notes due July 1, 2001 issued under Note Purchase
     Agreements dated as of August 1, 1996, containing an amendment to such Note
     Purchase Agreements identical in substance to the amendment set forth in
     Section 2 hereof.

                                       3
<PAGE>   4
                                                                 EXHIBIT 4(a)(8)

          (c) The execution, delivery and effectiveness of an agreement, signed
     by the Company and the requisite holders of the Company's Second Amended
     and Restated 9.27% Senior Notes due October 1, 2001 issued under Note
     Purchase Agreements dated as of March 25, 1997, containing an amendment to
     such Note Purchase Agreements identical in substance to the amendment set
     forth in Section 2 hereof.

          (d) The Company shall have paid the statement for reasonable fees and
     disbursements of Bingham Dana LLP, your special counsel, presented to the
     Company on or prior to the effective date of this Seventh Amendment.

     3.8 AMENDMENT TO CREDIT AGREEMENT. The Company represents that the Second
Amendment to the Credit Agreement, as in effect on the date of the effectiveness
of this Seventh Amendment, is in the form attached as Attachment 1 hereto.

     3.9 FULL DISCLOSURE. The Company warrants and represents to you that, as of
the effective date hereof, none of the written statements, documents or other
written materials furnished by, or on behalf of, the Company to you in
connection with the negotiation, execution and delivery of this Seventh
Amendment contain any untrue statement of a material fact or omit a material
fact necessary to make the statements contained therein or herein not misleading
in light of the circumstances in which they were made. There is no fact of which
any of the Company's executive officers has actual knowledge which the Company
has not disclosed to you which materially affects adversely or, so far as the
Company can now reasonably foresee, will materially affect adversely the
business, prospects, profits, Properties or condition (financial or otherwise)
of the Company and the Subsidiaries, taken as a whole, or the ability of the
Company to perform its obligations set forth in the Agreement (after giving
effect to this Seventh Amendment) and the Notes.

      [Remainder of page intentionally blank. Next page is signature page.]

                                       4

<PAGE>   5

                                                                 EXHIBIT 4(a)(8)

     If this Seventh Amendment is satisfactory to you, please sign the form of
acceptance on the enclosed counterpart of this letter and return the same to the
Company, whereupon this Seventh Amendment shall become binding between us in
accordance with its terms.

                                             Very truly yours,

                                             CREDIT ACCEPTANCE CORPORATION

                                             By       /S/BRETT A. ROBERTS
                                               ---------------------------------
                                             Name:    Brett A. Roberts
                                             Title:   Co-President

  [Signature Page to Seventh Amendment to Note Purchase Agreement in respect of
   10.37% Senior Notes Due November 1, 2001 of Credit Acceptance Corporation]

                                       5

<PAGE>   6
                                                                 EXHIBIT 4(a)(8)

ACCEPTED:                   ALLSTATE LIFE INSURANCE CO.

                            By       /S/RONALD A. MENDEL
                              --------------------------------------------------
                                     Name:      Ronald A. Mendel
                                     Title:     Authorized Signatory

                            By       /S/PATRICIA W. WILSON
                              --------------------------------------------------
                                     Name:      Patricia W. Wilson
                                     Title:     Authorized Signatory

                            WILLIAM BLAIR & COMPANY, LLC

                            By       William Blair & Company, LLC, Attorney-
                                     in-Fact

                            By       /S/JAMES D. MCKINNEY
                              --------------------------------------------------
                                     Name:      James D. McKinney
                                     Title:     Principal and Manager
                                                Fixed Income Department

                           CONNECTICUT GENERAL LIFE
                           INSURANCE COMPANY
                           BY CIGNA INVESTMENTS, INC. (authorized agent)

                           By       /S/JAMES R. KUZEMCHAK
                             ---------------------------------------------------
                                   Name:      James R. Kuzemchak
                                   Title:     Managing Director

                           CONNECTICUT GENERAL LIFE
                           INSURANCE COMPANY,
                           ON BEHALF OF ONE OR MORE SEPARATE ACCOUNTS
                           BY CIGNA INVESTMENTS, INC. (authorized agent)

                           By      /S/JAMES R. KUZEMCHAK
                             ---------------------------------------------------
                                   Name:      James R. Kuzemchak
                                   Title:     Managing Director

  [Signature Page to Seventh Amendment to Note Purchase Agreement in respect of
   10.37% Senior Notes Due November 1, 2001 of Credit Acceptance Corporation]

                                       6

<PAGE>   7
                                                                 EXHIBIT 4(a)(8)

ACCEPTED:                  ACE PROPERTY AND CASUALTY
                           INSURANCE COMPANY (F.K.A. CIGNA
                           PROPERTY AND CASUALTY INSURANCE COMPANY)
                           BY CIGNA INVESTMENTS, INC. (authorized agent)

                           By      /S/JAMES R. KUZEMCHAK
                             ---------------------------------------------------
                                   Name:      James R. Kuzemchak
                                   Title:     Managing Director

                           PHOENIX HOME LIFE MUTUAL
                           INSURANCE COMPANY
                           BY: PHOENIX INVESTMENT COUNSEL, INC.

                           By       /S/ROSEMARY T. STREKEL
                             ---------------------------------------------------
                                    Name:      Rosemary T. Strekel
                                    Title:     Senior Managing Director

  [Signature Page to Seventh Amendment to Note Purchase Agreement in respect of
   10.37% Senior Notes Due November 1, 2001 of Credit Acceptance Corporation]

                                       7

<PAGE>   8
                                                                 EXHIBIT 4(a)(8)

                                     ANNEX I
                 SECOND AMENDED AND RESTATED 10.37% SENIOR NOTES
                              DUE NOVEMBER 1, 2001

Allstate Life Insurance Company
Connecticut General Life Insurance Company
Ace Property and Casualty Insurance Company (f.k.a CIGNA Property and Casualty
     Insurance Company)
Phoenix Home Life Mutual Insurance Company
William Blair & Company, LLC

                                       8<PAGE>   1

                                                               EXHIBIT 4(b)(6)

                   FIFTH AMENDMENT TO NOTE PURCHASE AGREEMENT
                                       RE:
                          CREDIT ACCEPTANCE CORPORATION
         SECOND AMENDED AND RESTATED 9.49% SENIOR NOTES DUE JULY 1, 2001

                                                      Dated as of April 27, 2000
                                                Effective as of December 1, 1999

To the Noteholders listed on Annex I hereto

Ladies and Gentlemen:

     Credit Acceptance Corporation, a Michigan corporation (together with its
successors and assigns, the "Company"), hereby agrees with you as follows:

SECTION 1.     INTRODUCTORY MATTERS.

     1.1       DESCRIPTION OF OUTSTANDING NOTES. The Company currently has
outstanding its Second Amended and Restated 9.49% Senior Notes due July 1, 2001
(collectively, the "Notes") which it issued pursuant to the separate Note
Purchase Agreements, each dated as of August 1, 1996 (collectively, as amended
by the First Amendment to Note Purchase Agreement, dated as of December 12,
1997, the Second Amendment to Note Purchase Agreement, dated as of July 1, 1998,
the Third Amendment to Note Purchase Agreement, dated as of April 13, 1999, and
the Fourth Amendment, dated as of December 1, 1999, the "Agreement"), entered
into by the Company with each of the original holders of the Notes listed on
Annex 1 thereto, respectively. Terms used herein but not otherwise defined
herein shall have the meanings assigned thereto in the Agreement, as amended
hereby.

     1.2       PURPOSE OF AMENDMENT. The Company and you desire to amend the
Agreement as set forth in Section 2 hereof.

SECTION 2.     AMENDMENT TO THE AGREEMENT.

     Pursuant to Section 10.5 of the Agreement, the Company hereby agrees with
you that the Agreement shall be amended by this Fifth Amendment to Note Purchase
Agreement (this "Fifth Amendment") in the following respect:

     2.1       SECTION 6.1(B). Clause (i) of Section 6.1(b) is hereby amended in
its entirety as follows:

                    (i) two hundred percent (200%) of Consolidated Tangible Net
               Worth at such time, provided that for purposes of this test,
               Consolidated Senior Funded Debt shall be calculated by including
               all

<PAGE>   2

                                                                 EXHIBIT 4(b)(6)

               Debt incurred by a Special Purpose Subsidiary, whether or not
               included therein under GAAP, or

     2.2       SECTION 6.1(C). Section 6.1(c) is hereby amended in its entirety
as follows:

                    (C) SUBORDINATED FUNDED DEBT. The Company will not at any
               time permit Consolidated Subordinated Funded Debt to exceed one
               hundred fifty percent (150%) of Consolidated Tangible Net Worth
               at such time, provided that for purposes of this test,
               Consolidated Subordinated Funded Debt shall be calculated by
               including all Debt incurred by a Special Purpose Subsidiary,
               whether or not included therein under GAAP.

     2.3       SECTION 9.1. The definition of Consolidated Tangible Net Worth in
Section 9.1 is hereby amended and restated in its entirety as set forth below.

     CONSOLIDATED TANGIBLE NET WORTH -- means, at any time, the result of

               (a)  the shareholders' equity of the Company and its
                    Subsidiaries, minus

               (b)  the retained earnings of the Unrestricted Subsidiaries,
                    minus

               (c)  all Intangible Assets of the Company and the Subsidiaries,
                    minus

               (d)  without duplication, any excess servicing asset
                    resulting from the Transfer, pursuant to a Permitted
                    Securitization, of Advances, Leased Vehicles, Installment
                    Contracts (whether assigned outright or related to Advances)
                    or Leases (whether assigned outright or related to Leased
                    Vehicles),

in each case as would be reflected on a consolidated balance sheet of such
Persons at such time. As used in this definition, "Consolidated Net Worth"
means, at any time, the amount of "consolidated total assets" less the amount of
"consolidated total liabilities", as each would be reflected on a consolidated
balance sheet of the Company and its Subsidiaries at such time, prepared in
accordance with GAAP.

SECTION 3.     MISCELLANEOUS

     3.1       COUNTERPARTS. This Fifth Amendment may be executed in any number
of counterparts, each executed counterpart constituting an original, but all
together only one Fifth Amendment.

                                       2
<PAGE>   3

                                                                 EXHIBIT 4(b)(6)

     3.2       HEADINGS. The headings of the sections of this Fifth Amendment
are for purposes of convenience only and shall not be construed to affect the
meaning or construction of any of the provisions hereof.

     3.3       GOVERNING LAW. This Fifth Amendment shall be governed by and
construed in accordance with the internal laws of the State of Connecticut.

     3.4       EFFECT OF AMENDMENT. Except as expressly provided herein (a) no
other terms and provisions of the Agreement shall be modified or changed by this
Fifth Amendment and (b) the terms and provisions of the Agreement, as amended by
this Fifth Amendment, shall continue in full force and effect. The Company
hereby acknowledges and reaffirms all of its obligations and duties under the
Agreement, as modified by this Fifth Amendment, and the Notes.

     3.5       REFERENCES TO THE AGREEMENT. Any and all notices, requests,
certificates and other instruments executed and delivered concurrently with or
after the execution of the Fifth Amendment may refer to the Agreement without
making specific reference to this Fifth Amendment but nevertheless all such
references shall be deemed to include, to the extent applicable, this Fifth
Amendment unless the context shall otherwise require.

     3.6       COMPLIANCE. The Company certifies that immediately before and
after giving effect to this Fifth Amendment, no Default or Event of Default
exists or would exist after giving effect hereto; provided that the Company is
not in compliance with the covenant contained in Section 6.3 before giving
effect to this Fifth Amendment.

     3.7       EFFECTIVENESS OF AMENDMENTS. The amendments to the Agreement
contemplated by Section 2 hereof shall (in accordance with Section 10.5(a) of
the Agreement) become effective (retroactive to December 1, 1999), if at all, at
such time as the Company and the Required Holders of the Notes shall have
indicated their written consent to such amendments by executing and delivering
the applicable counterparts of this Fifth Amendment. It is understood that any
holder of Notes may withhold its consent for any reason, including, without
limitation, any failure of the Company to satisfy all of the following
conditions:

               (a)  This Fifth Amendment shall have been executed and delivered
     by the Company and each of the Required Holders of the Notes.

               (b)  The execution, delivery and effectiveness of an agreement,
     signed by the Company and the requisite holders of the Company's Second
     Amended and Restated 10.37% Senior Notes due November 1, 2001 issued under
     Note Purchase Agreements dated as of October 1, 1994, containing an
     amendment to such Note Purchase Agreements identical in substance to the
     amendment set forth in Section 2 hereof.

               (c)  The execution, delivery and effectiveness of an agreement,
     signed by the Company and the requisite holders of the Company's Second
     Amended and Restated 9.27%

                                       3

<PAGE>   4

                                                                 EXHIBIT 4(b)(6)

     Senior Notes due October 1, 2001 issued under Note Purchase Agreements
     dated as of March 25, 1997, containing an amendment to such Note Purchase
     Agreements identical in substance to the amendment set forth in Section 2
     hereof.

               (d)  The Company shall have paid the statement for reasonable
     fees and disbursements of Bingham Dana LLP, your special counsel, presented
     to the Company on or prior to the effective date of this Fifth Amendment.

     3.8       AMENDMENT TO CREDIT AGREEMENT. The Company represents that the
Second Amendment to the Credit Agreement, as in effect on the date of the
effectiveness of this Fifth Amendment, is in the form attached as Attachment 1
hereto.

     3.9       FULL DISCLOSURE. The Company warrants and represents to you that,
as of the effective date hereof, none of the written statements, documents or
other written materials furnished by, or on behalf of, the Company to you in
connection with the negotiation, execution and delivery of this Fifth Amendment
contain any untrue statement of a material fact or omit a material fact
necessary to make the statements contained therein or herein not misleading in
light of the circumstances in which they were made. There is no fact of which
any of the Company's executive officers has actual knowledge which the Company
has not disclosed to you which materially affects adversely or, so far as the
Company can now reasonably foresee, will materially affect adversely the
business, prospects, profits, Properties or condition (financial or otherwise)
of the Company and the Subsidiaries, taken as a whole, or the ability of the
Company to perform its obligations set forth in the Agreement (after giving
effect to this Fifth Amendment) and the Notes.

         [Remainder of page intentionally blank.  Next page is signature page.]

                                       4

<PAGE>   5

                                                                 EXHIBIT 4(b)(6)

     If this Fifth Amendment is satisfactory to you, please sign the form of
acceptance on the enclosed counterpart of this letter and return the same to the
Company, whereupon this Fifth Amendment shall become binding between us in
accordance with its terms.

                                        Very truly yours,

                                        CREDIT ACCEPTANCE CORPORATION

                                        By /S/ BRETT A. ROBERTS
                                          ------------------------
                                           Name:  Brett A. Roberts
                                           Title: Co-President

   [Signature Page to Fifth Amendment to Note Purchase Agreement in respect of
      9.49% Senior Notes Due July 1, 2001 of Credit Acceptance Corporation]

                                       5

<PAGE>   6

                                                                 EXHIBIT 4(b)(6)

ACCEPTED:                          ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR CENTRAL STATES HEALTH & LIFE
                                   COMPANY OF OMAHA

                                   By /S/ K. LANGE
                                     -------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

                                   ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR THE CHARLES SCHWAB TRUST COMPANY
                                   FBO GUARANTY INCOME LIFE INSURANCE COMPANY

                                   By /S/ K. LANGE
                                     -------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

                                   ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR AMERICAN COMMUNITY MUTUAL INSURANCE

                                   By /S/ K. LANGE
                                     -------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

                                   ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR CENTRAL RE CORP. & PHOENIX

                                   By /S/ K. LANGE
                                     -------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

   [Signature Page to Fifth Amendment to Note Purchase Agreement in respect of
      9.49% Senior Notes Due July 1, 2001 of Credit Acceptance Corporation]

                                       6
<PAGE>   7

                                                                 EXHIBIT 4(b)(6)

ACCEPTED:                          ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR OLD GUARD MUTUAL INSURANCE COMPANY

                                   By /S/ K. LANGE
                                     --------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

                                   ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR OZARK NATIONAL LIFE INSURANCE
                                   COMPANY

                                   By /S/ K. LANGE
                                     --------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

                                   ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR CSA FRATERNAL LIFE

                                   By /S/ K. LANGE
                                     --------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

                                   ASSET ALLOCATION & MANAGEMENT COMPANY AS
                                   AGENT FOR KANAWHA INSURANCE COMPANY

                                   By /S/ K. LANGE
                                     --------------------------
                                      Name:  Kathy Lange
                                      Title: Portfolio Manager

   [Signature Page to Fifth Amendment to Note Purchase Agreement in respect of
      9.49% Senior Notes Due July 1, 2001 of Credit Acceptance Corporation]

                                       7

<PAGE>   8

                                                                 EXHIBIT 4(b)(6)

ACCEPTED:                          CONNECTICUT GENERAL LIFE INSURANCE COMPANY
                                   BY CIGNA INVESTMENTS, INC. (authorized agent)

                                   By /S/ JAMES R. KUZEMCHAK
                                     --------------------------
                                     Name:  James R. Kuzemchak
                                     Title: Managing Director

                                   CONNECTICUT GENERAL LIFE INSURANCE COMPANY,
                                   ON BEHALF OF ONE OR MORE SEPARATE ACCOUNTS
                                   BY CIGNA INVESTMENTS, INC. (authorized agent)

                                   By /S/ JAMES R. KUZEMCHAK
                                     --------------------------
                                     Name:  James R. Kuzemchak
                                     Title: Managing Director

                                   PAN AMERICAN LIFE INSURANCE COMPANY

                                   By /S/ ROBERT NAGEL
                                     ----------------------
                                     Name:  Robert Nagel
                                     Title: Vice President

                                   PHOENIX HOME LIFE MUTUAL INSURANCE COMPANY
                                   BY: PHOENIX INVESTMENT COUNSEL, INC.

                                   By /S/ ROSEMARY T. STREKEL
                                     --------------------------------
                                     Name:  Rosemary T. Strekel
                                     Title: Senior Managing Director

   [Signature Page to Fifth Amendment to Note Purchase Agreement in respect of
      9.49% Senior Notes Due July 1, 2001 of Credit Acceptance Corporation]

                                       8

<PAGE>   9

                                                                 EXHIBIT 4(b)(6)

                                     ANNEX I
         SECOND AMENDED AND RESTATED 9.49% SENIOR NOTES DUE JULY 1, 2001

Central States Health & Life Company of Omaha
The Charles Schwab Trust Company fbo Guaranty Income Life Insurance Company
American Community Mutual Insurance
Central Re Corp. & Phoenix
Ozark National Life Insurance Company
CSA Fraternal Life
Kanawha Insurance Company
Old Guard Mutual Insurance Company
Connecticut General Life Insurance Company
Pan American Life Insurance Company
Phoenix Home Life Mutual Insurance Company

                                       9

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