Document:

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                                EXHIBIT 10(b)(6)

                       GENTEX CORPORATION GRANT AGREEMENT

DATE:    ____________________

Name:    ___________________________
Address: ___________________________
         ___________________________

Dear _____________:

Pursuant to the terms and conditions of the company's 2002 Non-Employee Director
Plan (the "Plan"), you have been granted a Non-Qualified Stock Option to
purchase ________ shares (the "Option") of stock as outlined below.

    Granted To:               _________________________

    SS #                      _________________________

    Grant Date:               _____________

    Option Price Per Share:   $___________      Total Cost to Exercise: $______

    Expiration Date:          ______________

    Vesting Schedule:         Non-Employee Director Vesting
                              _____________________________

By my signature below, I hereby acknowledge receipt of this Option granted on
the date shown above, which has been issued to me under the terms and conditions
of the Plan. I further acknowledge receipt of the copy of the Plan and agreed to
conform to all of the terms and conditions of the Option and the Plan.

Please return one signed copy of this agreement to Steve Dykman.

Signature: ________________________           Date: _________________
           (Name)

NOTE: If there are any discrepancies in the name or address shown above, please
      make the appropriate corrections on this form.

                                      -26-
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      1.OPTION PLAN. All of the defined terms contained in this Agreement shall
have the same meaning as is set forth in the Gentex Corporation 2002
Non-employee Director Stock Option Plan (the "Plan"), and this Option Agreement
(the "Agreement") is subject to the terms and provisions of that Plan, as
amended from time to time. If any inconsistency exists between the provisions of
this Agreement and the Plan, the Plan shall govern.

      2.    OPTION GRANT. Effective as of the Grant Date, the Optionee has been
granted an option to purchase that Number of Shares of the Company's common
stock at the Exercise Price for a period ending on the Expiration Date, all as
shown on the cover page hereof.

      3.    EXERCISE. Options may not be exercised for fewer than the Minimum
Shares per transaction specified on the cover page, and options shall become
exercisable only in accordance with the Vesting Schedule specified on the cover
page. Options shall be exercised by written notice to the Company stating the
number of shares to be purchased, signed by the person exercising the option,
and accompanied by payment of the full purchase price of the shares in cash or
in shares of the Company's common stock, or by any combination of cash and
stock. Options may be exercised only during periods beginning on the second
business day following the date on which the Company releases for publication
its annual or quarterly financial reports, and ending on the twelfth business
day following that date. Promptly after exercise, the Company shall issue a
stock certificate representing that number of shares to which the option was
exercised.

      4.    OPTIONEE'S AGREEMENT. In consideration of the granting of the
option, the Optionee agrees to continue to serve as a director of the Company
during the term for which he or she was elected.

      5.    TRANSFERS. This Agreement and the option it represents shall not be
transferable by the Optionee other than by will or the laws of descent and
distribution, and may be exercised during the lifetime of the Optionee only by
the Optionee or his or her guardian or legal representative, except as
hereinafter provided. Notwithstanding the previous sentence, this option may be
transferred, in whole or in part, to the Optionee's spouse, and/or the
Optionee's descendants and/or to a trust created primarily for the benefit of
the Optionee, the Optionee's spouse and/or the Optionee's descendants
("Authorized Transfer"); provided, however, that no payment of anything of value
shall be made to the Optionee in consideration of any such transfer, and no
Authorized Transferee shall be entitled to make any further assignment or other
transfer of the option. Any transferred option may be exercised during the
Optionee's lifetime by the Authorized Transferee. Except as expressly provided
above, this option shall not be transferred, assigned, pledged, or hypothecated
in any way, shall not be assignable by operation of law, and shall not be
subject to execution, levy, attachment, or similar process. Any attempted
transfer, assignment, pledge, hypothecation, or other disposition of this option
contrary to the terms hereof, and any execution, levy attachment or similar
process upon the option, shall render this option null and void and without
effect.

      6.    DEATH OF OPTIONEE. In the event of the Optionee's death, the
Optionee, the Optionee's personal representative or legatee, or an Authorized
Transferee, as the case may be, may exercise this option for a period of twelve
(12) months after the date of death or disability, to the extent then
exercisable. In no event, however, shall this option be exercised after the
Expiration Date.

                                                                   ____ INITIALS

                                      -27-
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      7.    ADJUSTMENTS. In the event of any change in the number of outstanding
shares or the Company's common stock by reason of a stock dividend, stock split,
recapitalization, merger, consolidation, split-up, combination, or exchange of
shares, without the receipt of consideration by the Company, then the number of
shares subject to this option, and the option price shall be appropriately
adjusted as provided in the Plan.

      8.    RIGHTS AS A SHAREHOLDER. Neither the Optionee nor a transferee of
this option shall have any rights as a shareholder with respect to any shares
covered hereby until the date he or she shall have become the holder of record
of such shares. No adjustment shall be made for dividends, distributions, or
other rights for which the record date is prior to the date on which he or she
shall have become the holder of record thereof, except as provided in paragraph
7 above.

      9.    TERMINATION. All or any portion of the option that is the subject to
this Agreement, and all or any portion of any other option previously granted to
the Optionee with respect to the Company's common stock, that remains
unexercised at the time the Optionee's status as a director of the Company
terminates for any reason other than death, shall automatically expire ninety
(90) days after the date of such termination and be of no further force or
effect.

                                                                     __ INITIALS

                                      -28-<PAGE>

                                                                    EXHIBIT 10.1

                             STOCK OPTION AGREEMENT
                       FOR AN INCENTIVE STOCK OPTION UNDER
                         THE MERCANTILE BANK CORPORATION
                         2004 EMPLOYEE STOCK OPTION PLAN

         This STOCK OPTION AGREEMENT is executed and delivered in duplicate, as
of the ____ day of __________, ______ (the "Option Date"), by and between
Mercantile Bank Corporation, a Michigan corporation (the "Company"), and
_________________, an employee of the Company or a Subsidiary (the "Optionee").

         NOW, THEREFORE, in consideration of the mutual covenants of the parties
hereinafter set forth, the parties have agreed and do hereby agree, as follows:

         1. The Company, pursuant to the 2004 Employee Stock Option Plan of the
Company (the "Plan"), which is incorporated into this Agreement by reference,
and subject to the terms and conditions of the Plan, grants to the Optionee an
Incentive Stock Option (the "Option") to purchase ________ shares (the "Optioned
Shares") of Common Stock of the Company at an option price of $_______ per share
(which price represents the fair market value of such Common Stock of the
Company on the Option Date), which Option may be exercised at any time on or
after ____________, 20__ [with respect to _________ shares, and at any time on
or after _________ ___, 20__ with respect to the remaining _________ shares, in
each case] through the date that the Option terminates as set forth in Section 2
below.

         2. The option granted hereby shall terminate, subject to the provisions
of the Plan, no later than at the close of business on _________, 20___.

         3. The option granted by this Agreement shall during the lifetime of
the Optionee be exercisable only by the Optionee in accordance with the terms of
the Plan and shall not be assignable or transferable except by Will or by the
laws of descent and distribution; provided, however, that the option granted by
this Agreement may after the death of the Optionee be exercised pursuant to the
terms of the Plan by a Beneficiary or Beneficiaries of the Optionee as
designated by such Optionee in accordance with Section 6.7(b) of the Plan.

         4. The Optionee agrees to comply with and be bound by all the terms and
conditions contained in the Plan.

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         5. Any notice by the Optionee to the Company under this Agreement shall
be in writing and shall be deemed duly given only upon receipt of the notice by
the Company at its principal executive offices. Any notice by the Company to the
Optionee shall be in writing and shall be deemed duly given if mailed to the
Optionee at the address specified below by the Optionee, or to such other
address as the Optionee may later designate by notice given to the Company.

         6. The Optionee, from time to time during the period when the Option
may by its terms be exercised, may exercise the Option in whole, or in part in
minimum installments of 500 shares, by delivering to the Company: (i) a written
notice signed by the Optionee stating the number of shares that the Optionee has
elected to purchase at that time from the Company, and (ii) cash, a check, bank
draft or money order payable to the Company in an amount equal to the purchase
price of the shares then to be purchased, or (iii) through the delivery of
shares of Common Stock of the Company owned by the Optionee for more than six
months with a value equal to the option price, provided, however, that shares of
Common Stock acquired by the Optionee through the exercise of an incentive stock
option may not be used for payment prior to the expiration of holding periods
prescribed by the Internal Revenue Code, or (iv) by a combination of (ii) and
(iii) above. The value of the shares of the Common Stock delivered shall be the
Fair Market Value of the Common Stock as defined in Section 2.1(e) of the Plan.
The Board of Directors of the Company, acting pursuant to the Plan, if it shall
deem it necessary or desirable for any reason connected with any law or
regulation of any governmental authority relating to the regulation of
securities, may require the Optionee to execute and file with it such evidence
as it may deem necessary that the Optionee is acquiring such shares for
investment and not with a view to their distribution.

         7. A dissolution or liquidation of the Company or a merger or
consolidation in which the Company is not the surviving corporation, at the
discretion of the Board of Directors of the Company, shall cause this Option to
terminate, provided that this Option shall be fully vested and exercisable
immediately prior to such dissolution or liquidation, or such merger or
consolidation, and the Optionee has the right to exercise this Option prior to
such dissolution or liquidation, or such merger or consolidation. This Option
shall not affect in any way the right or power of the Company to make
adjustments, reclassifications, reorganizations, or changes of its capital or
business structure, or to merge or consolidate, or to dissolve, liquidate or
sell, or transfer all or any part of its business or assets.

         8. The validity and construction of this Agreement shall be governed by
the laws of the State of Michigan.

                                       2
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         The Company has caused this Agreement to be executed by its duly
authorized officer, and the Optionee has executed this Agreement, as of the
Option Date.

                                               MERCANTILE BANK CORPORATION

                                               By:
                                                   -----------------------------

                                                     Its:
                                                         -----------------------

                                               OPTIONEE

                                               ---------------------------------
                                                          (Signature)

                                               ---------------------------------

                                               ---------------------------------

                                               ---------------------------------
                                                        (Print address)

                                       3
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                           MERCANTILE BANK CORPORATION

                                STOCK OPTION PLAN
                           DESIGNATION OF BENEFICIARY

       Check One,                   I do not wish to designate a Beneficiary at
       Complete as    -----         this time; it is my desire that any right to
       Applicable,                  exercise this option after my death pass by
       and Sign                     my Will or if applicable, the laws of
                                    descent and distribution.

                      -----         In the event of my death it is my desire
                                    that any right to exercise this option pass
                                    to the following designated Beneficiar(ies):

                                    Name          Relationship         Address

                                    --------------------------------------------

                                    --------------------------------------------

                                    (If more than one Beneficiary is named, the
                                    Beneficiaries shall share equally in the
                                    rights unless otherwise stated above).

                                    Unless otherwise expressly provided, if any
                                    Beneficiary above-designated predeceases me,
                                    any rights shall pass equally to the
                                    remaining designated Beneficiar(ies) if any,
                                    who survive me, but if no designated
                                    Beneficiary survives me, any rights shall
                                    pass to my estate.

                                    Optionee may change the Beneficiar(ies) by
                                    filing written notice with the Company.

                                    The designation of Beneficiary herein is
                                    subject to all the terms and conditions of
                                    the Plan and all applicable laws, rules and
                                    regulations. In addition, the Company may
                                    require an indemnity and/or other assurances
                                    from the Beneficiar(ies) prior to the
                                    exercise of any rights by such
                                    Beneficiar(ies) under this option.

                                    Date:
                                           -------------   ---------------------
                                                           Signature of Optionee

                                       4

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