Document:

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                                                           BANCFIRST CORPORATION
                                                                    EXHIBIT 10.6

                 BANCFIRST CORPORATION NON-EMPLOYEE DIRECTORS'
                               STOCK OPTION PLAN

1.       PURPOSE. The BancFirst Corporation Non-Employee Directors' Stock Option
         -------
         Plan (the "Plan") is intended as an incentive and to encourage stock
         ownership by the non-employee directors of BancFirst Corporation (the
         "Corporation") in order to increase their proprietary interest in the
         Corporation's success.

2.       DEFINITIONS. As used herein, the following terms shall have the
         -----------
         corresponding meanings:

         2.1.     "Committee" shall mean the Board of Directors of the
                  Corporation, or a duly constituted committee of the Board
                  consisting of three or more members, at least a majority of
                  which shall be "Non-Employee Directors" as such term is used
                  in Rule 16b-3 promulgated under the Securities Exchange Act of
                  1934, as amended (the "Exchange Act").

         2.2      "Common Stock" shall mean the common stock, par value $1.00
                  per share, of the Corporation.

         2.3.     "Date of Grant" shall mean the date of grant of a Stock Option
                  granted hereunder as set forth in the Stock Option Agreement.
                  In the event of a grant conditioned, among other things, upon
                  stockholder ratification of this Plan, the date of such
                  conditional grant shall be the Date of Grant for purposes of
                  this Plan.

         2.4.     "Non-Employee Director" shall mean a person that is an elected
                  or appointed Director or Advisory Director of a corporation,
                  who is not a common-law employee of the corporation. The
                  determination of whether or not a person is a Non-Employee of
                  the Corporation with respect to the grant or exercise of a
                  Stock Option shall be made in accordance with the rule of
                  Income Tax Regulation Section 1.421-7(h) (or successor
                  regulation).

         2.5.     "Fair Market Value" shall mean, with respect to the exercise
                  of an option under the Plan, (a) if the Common Stock is listed
                  on a national securities exchange or the NASDAQ National
                  Market System, the closing price of the Common Stock for the
                  business day immediately preceding the day for which the
                  determination is being made, or (b) if the Common Stock is not
                  then listed on an exchange, the average of the closing bid and
                  asked prices per share for the Common Stock in the
                  over-the-counter market as quoted on NASDAQ for the business
                  day immediately preceding the day for which the determination
                  is being made, or (c) if the Common Stock is not then listed
                  on any exchange or quoted on NASDAQ, an amount determined in
                  good faith by the Committee to be the fair market value of the
                  Common Stock, after consideration of all relevant factors.

         2.6      "Nonqualified Stock Option" shall mean a Stock Option which is
                  not intended to qualify for tax treatment as an "incentive
                  stock option" under Section 422 of the Code.

         2.7.     "Option Exercise Price" shall mean the price paid for Shares
                  upon the exercise of a Stock Option granted hereunder.

         2.8.     "Optionee" shall mean any person entitled to exercise a Stock
                  Option pursuant to the terms of the Plan.

         2.9.     "Stock Option" shall mean a stock option giving an Optionee
                  the right to purchase shares of the Corporation's Common
                  Stock. Stock Options granted under the Plan shall be
                  Nonqualified Stock Options.
<PAGE>

3.       ADMINISTRATION.
         --------------

         3.1      AUTHORITY; INDEMNIFICATION. Within the limitations described
                  herein, the Committee shall administer the Plan, determine the
                  method of payment upon exercise of each Stock Option,
                  determine all other terms of Stock Options granted hereunder
                  and interpret, construe and implement the provisions of the
                  Plan. All questions of interpretation of the Plan or any Stock
                  Option granted under the Plan shall be determined by the
                  Committee, and such decisions shall be binding upon all
                  persons having an interest in the Plan and/or any Stock
                  Option. No member of the Committee shall be liable for any
                  action or determination made in good faith, and the members
                  shall be entitled to indemnification and reimbursement in the
                  manner provided in the Corporation's Certificate of
                  Incorporation, or as otherwise permitted by law.

         3.2      RULE 16B-3 COMPLIANCE. With respect to the participation of
                  eligible participants who are subject to Section 16(b) of the
                  Exchange Act, the Plan shall be administered in compliance
                  with the requirements of Rule 16b-3.

         3.3      SECTION 162(M) COMPLIANCE. In the event the Corporation is a
                  "publicly held corporation" as defined in paragraph (2) of
                  section 162(m) of the Code, as amended by the Revenue
                  Reconciliation Act of 1993 (P.L. 103-66), and the regulations
                  promulgated thereunder ("Section 162(m)"), the Corporation
                  shall establish a committee of outside directors meeting the
                  requirements of Section 162(m) to approve the grant of Stock
                  Options which might reasonably be anticipated to result in the
                  payment of employee remuneration that would otherwise exceed
                  the limit on employee remuneration deductible for income tax
                  purposes pursuant to Section 162(m).

4.       ELIGIBILITY. The individuals who shall be eligible to participate in
         -----------
         the Plan shall be such Non-Employee Directors of the Corporation, or of
         any corporation ("Subsidiary") in which the Corporation has proprietary
         interest by reason of stock ownership or otherwise, including any
         corporation in which the Corporation acquires a proprietary interest
         after the adoption of this Plan (but only if the Corporation owns,
         directly or indirectly, stock possessing not less than 50% of the total
         combined voting power of all classes of stock in the corporation), as
         the Committee shall determine from time to time.

5.       STOCK. The stock subject to Stock Options and other provisions of the
         -----
         Plan shall be shares of the Corporation's authorized but unissued
         Common Stock or treasury stock, as determined by the Committee. Subject
         to adjustment in accordance with the provisions of Subparagraph 6.7
         hereof, the total number of shares of Common Stock of the Corporation
         on which Stock Options may be granted under the Plan shall not exceed
         in the aggregate 75,000 shares. In the event that any outstanding Stock
         Option under the Plan for any reason expires or is terminated prior to
         the end of the period during which Stock Options may be granted, the
         shares of the Common Stock allocable to the unexercised portion of such
         Stock Option may again be subject to a Stock Option under the Plan.

6.       TERMS AND CONDITIONS OF STOCK OPTIONS. Stock Options granted pursuant
         -------------------------------------
         to the Plan shall be evidenced by agreements in such form as the
         Committee shall, from time to time, approve. Agreements shall comply
         with and be subject to the following terms and conditions:

         6.1      MEDIUM AND TIME OF PAYMENT. The Option Exercise Price shall be
                  payable in United States Dollars upon the exercise of the
                  Stock Option and may be paid in cash or by certified check,
                  bank draft or money order payable to the order of the
                  Corporation, unless otherwise determined by the Committee.

         6.2      NUMBER OF SHARES. Each Non-Employee Director shall be granted
                  a Stock Option for 5,000 shares.

         6.3      OPTION EXERCISE PRICE. The Option Exercise Price shall be
                  equal to the Fair Market Value of the Common Stock on the Date
                  of Grant.
<PAGE>

         6.4      TERM OF STOCK OPTIONS. Any Stock Option granted must be
                  exercised within fifteen (15) years of the date of such grant.

         6.5      DATE OF EXERCISE. Unless otherwise determined by the Committee
                  at the time of granting a Stock Option, Stock Options shall be
                  exercisable at the rate set forth below beginning one year
                  from the Date of Grant. After becoming exercisable, the Stock
                  Option may be exercised at any time and from time to time in
                  whole or in part until termination of the Stock Option as set
                  forth in Sections 6.4 or 6.6.

                                                                   Cumulative
                  Elapsed Years from          Percent              Percent
                  Date of Grant               of Shares            of Shares
                  -------------               ---------            ---------

                  less than 1 year                0%                   0%
                  1 to 2 years                   25%                  25%
                  2 to 3 years                   25%                  50%
                  3 to 4 years                   25%                  75%
                  more than 4 years              25%                 100%

         6.6      TERMINATION OF BOARD SERVICE. In the event that an Optionee's
                  service on the board of directors of the Corporation shall
                  terminate, his Stock Option whether or not then exercisable
                  shall terminate immediately; provided, however, that if the
                  termination is not as a result of embezzlement, theft or other
                  violation of the law, the Optionee shall have the right to
                  exercise his option (to the extent exercisable at the time of
                  termination) at any time within 30 days after such
                  termination; provided, further, that if the Optionee shall die
                  while in service on the board of directors of the Corporation
                  or within the period of time after termination of service
                  during which he was entitled to exercise his option as
                  hereinabove provided, his estate, personal representative, or
                  beneficiary shall have the right to exercise his Stock Option
                  (to the extent exercisable at the date of death) at any time
                  within twelve (12) months from the date of his death.

         6.7      RECAPITALIZATION. The aggregate number of shares of Common
                  Stock on which Stock Options may be granted to persons
                  participating under the Plan, the number of shares thereof
                  covered by each outstanding Stock Option, and the price per
                  share thereof in each such Stock Option, shall all be
                  proportionately adjusted for any increase or decrease in the
                  number of issued shares of Common Stock of the Corporation
                  resulting from a subdivision or consolidation of shares or
                  other capital adjustment, or the payment of a stock dividend
                  or other increase or decrease in such shares, effected without
                  receipt of consideration by the Corporation; provided,
                  however, that any fractional shares resulting from such
                  adjustment shall be eliminated. In the event of a change in
                  the Corporation's Common Stock which is limited to a change in
                  the designation thereof to "Capital Stock" or other similar
                  designation, or a change in the par value thereof, or from par
                  value to no par value, without increase in the number of
                  issued shares, the shares resulting from any such change shall
                  be deemed to be Common Stock within the meaning of the Plan.

         6.8      REORGANIZATION OF CORPORATION. Subject to any required action
                  by the stockholders, if the Corporation shall be the surviving
                  or resulting corporation in any merger or consolidation which
                  does not result in change of control of the Corporation, any
                  Stock Option granted hereunder shall pertain to and apply to
                  the securities to which a holder of the number of shares of
                  Common Stock subject to the Stock Option would have been
                  entitled. In the event of a dissolution or liquidation of the
                  Corporation or a merger or consolidation in which the
                  Corporation is not the surviving or resulting corporation or
                  which results in a change in control of the Corporation, or a
                  tender or exchange offer which results in a change in control
                  of the Corporation, the Committee shall determine: (i) whether
                  all or any part of the unexercisable portion (as set forth in
                  section 6.5) of any Stock Option outstanding under the Plan
                  shall terminate; (ii) whether the Stock Options shall become
                  immediately exercisable;
<PAGE>

                  or (iii) whether such Stock Options may be exchanged for
                  options covering securities of any such surviving or resulting
                  corporation, subject to the agreement of any such surviving or
                  resulting corporation, on terms and conditions substantially
                  similar to a Stock Option hereunder.

         6.9      ASSIGNABILITY. Except as provided in this Section, no Stock
                  Option shall be assignable or transferable except as follows:

                  (a)   by will or by the laws of descent and distribution.

                  (b)   for the purpose of making a charitable gift.

                  (c)   to the Optionee as trustee of a revocable trust which
                        allows the Optionee to amend or revoke the trust at any
                        time. If the Optionee relinquishes his power to amend or
                        revoke the trust or appoints a trustee other than the
                        Optionee, the Optionee shall withdraw the Stock Option
                        from the trust prior to the relinquishment of such power
                        or appointment and revest title to the Stock Option in
                        the Optionee's individual name. If the trust becomes
                        irrevocable due to the death of the Optionee, the
                        successor trustee shall have the same power to exercise
                        the Stock Option under Section 6.6 as the personal
                        representative. If there is a successor trustee under
                        the trust due to the incapacity of the Optionee, the
                        date of incapacity shall be treated as termination of
                        employment under Section 6.6, and the successor trustee
                        shall have the same right to exercise the option as the
                        Optionee has under Section 6.6. The trustee or any
                        successor trustee shall be bound by all the terms and
                        conditions of the Plan and the Stock Option Agreement
                        entered into by the Plan and Optionee under this Plan.

                  (d)   to the extent set forth in the Stock Option Agreement
                        governing such Stock Option.

         6.10     OPTIONEE'S AGREEMENT. If, at the time of the exercise of any
                  Stock Option, it is necessary or desirable, in order to comply
                  with any applicable laws or regulations relating to the sale
                  of securities, that the Optionee exercising the Stock Option
                  shall agree that he will purchase the shares that are subject
                  to the Stock Option for investment and not with any present
                  intention to resell the same, the Optionee will, upon the
                  request of the Corporation, execute and deliver to the
                  Corporation an agreement to such effect.

         6.11     RIGHTS AS A STOCKHOLDER. An Optionee shall have no rights as a
                  stockholder with respect to shares covered by his Stock Option
                  until the date of issuance of the shares to him and only after
                  such shares are fully paid.

         6.12     OTHER PROVISIONS. The option agreements authorized under the
                  Plan may contain such other provisions as the Committee shall
                  deem advisable.

7.       MARKETABILITY OF SHARES. The Common Stock is currently traded on the
         -----------------------
         NASDAQ National Market System. As a result, its liquidity varies widely
         in response to supply and demand. Consequently, the Corporation can
         give no assurances as to the marketability of shares acquired under the
         Plan.

8.       TAX IMPLICATIONS. It is anticipated that Stock Options granted under
         ----------------
         the Plan will be treated as Nonqualified Stock Options by the Internal
         Revenue Service. As such, exercise of the Stock Option would generate a
         taxable event with the difference between the original Option Exercise
         Price and the Fair Market Value of the Common Stock at the time of
         exercise being treated as ordinary income.

9.       TERM OF PLAN. No Stock Option may be granted after December 31, 2014.
         ------------

10.      NO OBLIGATION TO EXERCISE OPTION. The granting of a Stock Option shall
         --------------------------------
         impose no obligation upon the Optionee to exercise such Stock Option.
<PAGE>

11.      AMENDMENTS. The Board of Directors may from time to time amend, alter,
         ----------
         suspend, or discontinue the Plan or alter or amend (including decrease
         of the Option Exercise Price by cancellation and substitution of
         options or otherwise) any and all option agreements granted thereunder;
         provided, however, that no such action of the Board of Directors may,
         without approval of the stockholders of the Corporation, alter the
         provisions of the Plan so as to (a) materially increase the benefits
         accruing to participants under the Plan; (b) materially increase the
         number of securities which may be issued under the Plan; or (c)
         materially modify the requirements as to eligibility for participation
         in the Plan; and provided, further, that no amendment may, without the
         consent of the Optionee, affect any then outstanding Stock Options or
         unexercised portions thereof. In addition, the approval of the
         Corporation's stockholders shall be sought for any amendment to the
         Plan or a Stock Option for which the Committee deems stockholder
         approval necessary in order to comply with Rule 16b-3.<PAGE>

                                                           BANCFIRST CORPORATION
                                                                    EXHIBIT 10.7

                        BANCFIRST CORPORATION DIRECTORS'
                        DEFERRED STOCK COMPENSATION PLAN
                        --------------------------------

                                   ARTICLE I

                          PURPOSE AND EFFECTIVE DATE
                          --------------------------

     1.1   Purpose.    The BancFirst Corporation Directors' Deferred Stock
           -------
Compensation Plan (the "Plan") is intended to advance the interests of the
Company and its shareholders by providing a means to attract and retain highly-
qualified persons to serve as Directors and to promote ownership by Directors of
a greater proprietary interest in the Company, thereby aligning such Directors'
interests more closely with the interests of shareholders of the Company.

     1.2   Effective Date.    This Plan shall become effective September 1,
           --------------
1999.

                                  ARTICLE II

                                  DEFINITIONS
                                  -----------

The following terms shall be defined as set forth below:

     2.1   "Bank" means BancFirst, an Oklahoma banking corporation, or any
successor thereto.

     2.2   "Bank Board" means the Board of Directors of the Bank.

     2.3   "Committee" means the Compensation Committee of the Company Board.

     2.4   "Community Board" means one of the Community Advisory Boards of the
Bank.

     2.5   "Company" means BancFirst Corporation, an Oklahoma corporation, or
any successor thereto.

     2.6   "Company Board" means the Board of Directors of the Company.

     2.7   "Deferral Date" means the date Fees would otherwise have been paid to
the Participant.

     2.8   "Director" means any individual who is a member of the Bank Board,
the Company Board or the Community Board.

     2.9   "Fair Market Value" means the closing sales price for the Shares on
the relevant date, or if there were no sales on such date the closing sales
price on the nearest day before the relevant date, as reported in The Wall
Street Journal or a similar publication selected by the Committee.

     2.10  "Fees" means all or part of any retainer and/or fees payable to a
Director in his or her capacity as a Director.

     2.11  "Participant" means a Director who defers Fees under Article VI of
this Plan.

     2.12  "Secretary" means the Corporate Secretary or any Assistant Corporate
Secretary of the Company.

     2.13  "Shares" means shares of the common stock of BancFirst Corporation,
par value $1.00 per share, or of any successor corporation or other legal entity
adopting this Plan.

     2.14  "Stock Units" means the credits to a Participant's Stock Unit
Account under Article VI of this Plan, each of which represents the right to
receive one Share upon settlement of the Stock Unit Account.

<PAGE>

     2.15   "Stock Unit Account" means the bookkeeping account established by
the Company pursuant to Section 6.4.

     2.16   "Termination Date" means the date the Plan terminates pursuant  to
Section 11.8.

     2.17   "Termination of Service" means termination of service as a Director
in any of the following circumstances:

            (a) Where the Participant voluntarily resigns or retires;

            (b) Where the Participant is not re-elected (or elected in the case
     of an appointed Director) to the Bank Board or Company Board, as
     applicable, by the shareholders, or to the Community Board by the Bank;

            (c) Where the Participant dies; or

            (d) Where the Participant is removed from the Bank Board, Company
     Board or Community Board, as applicable, in accordance with the provisions
     of the Company's Bylaws or the Bank's Bylaws, as applicable.

                                  ARTICLE III

                        SHARES AVAILABLE UNDER THE PLAN
                        -------------------------------

     Subject to adjustment as provided in Article X, the maximum number of
Shares that may be distributed in settlement of Stock Unit Accounts under this
Plan shall not exceed 20,000.  Such Shares may include authorized but unissued
Shares or treasury Shares.

                                   ARTICLE IV

                                 ADMINISTRATION
                                 --------------

     4.1   This Plan shall be administered by the Company Board's Compensation
Committee, or such other committee or individual as may be designated by the
Company Board.   Notwithstanding the foregoing, no director who is a Participant
under this Plan shall participate in any determination relating solely or
primarily to his or her own Shares, Stock Units or Stock Unit Account.

     4.2   It shall be the duty of the Committee to administer this Plan in
accordance with its provisions and to make such recommendations of amendments or
otherwise as it deems necessary or appropriate.

     4.3   The Committee shall have the authority to make all determinations it
deems necessary or advisable for administering this Plan, subject to the
limitations in Section 4.1 and other explicit provisions of this Plan.

                                   ARTICLE V

                                  ELIGIBILITY
                                  -----------

     5.1   Each Director shall be eligible to defer Fees under Article VI of
this Plan.

                                   ARTICLE VI

                  DEFERRAL ELECTIONS IN LIEU OF CASH PAYMENTS
                  -------------------------------------------

     6.1   General Rule.    Each Director may, in lieu of receipt of Fees, defer
           ------------
such Fees in accordance with this Article VI, provided that such Director is
eligible under Article V of this Plan to defer such Fees at the date any such
Fees are otherwise payable.

     6.2   Timing of Election.    Each eligible director who wishes to defer
           ------------------
Fees under this Plan must make a written election prior to the start of the
calendar year for which the Fees would otherwise be paid; provided, however,
that with respect to (a) any election made by a newly-elected or appointed
Director ("New Director Elections") and (b) any elections made by Directors with
respect to Fees paid on or after July 1, 1999 ("1999 Elections"), the following
special rules shall apply: (i) with respect to any New Director Elections, any
such New Director Election may be made prior to
<PAGE>

the first Deferral Date after election or appointment, and (ii) with respect to
any 1999 Elections, such elections shall be made prior to July 1, 1999 and shall
be effective for any Fees paid on or after July 1, 1999. An election by a
Director shall be deemed to be continuing and therefore applicable to Fees to be
paid in the future unless the Director evokes or changes such election by filing
a new election form by the due date for such form specified in this Section 6.2.

     6.3   Form of Election.    An election shall be made in a manner
           ----------------
satisfactory to the Secretary.  Generally, an election shall be made by
completing and filing the specified election form with the Secretary of the
company within the period described in Section 6.2.  At a minimum, the form
shall require the Director to specify the following:

               (a) a percentage (in 25% increments), not to exceed an aggregate
     of 100% of the Fees to be deferred under this Plan; and

               (b) the manner of settlement in accordance with Section 7.2.

     6.4   Establishment of Stock Unit Account.    The Company will establish a
           -----------------------------------
Stock Unit Account for each Participant.  All Fees deferred pursuant to this
Article VI shall be credited to the Participant's Stock Unit Account as of the
Deferral Date and converted to Stock Units as follows: The number of Stock Units
shall equal the deferred Fees divided by the Fair Market Value of a Share on the
Deferral Date, with fractional units calculated to three (3) decimal places.

     6.5   Credit of Dividend Equivalents.  As of each dividend payment date
           ------------------------------
with respect to Shares, each Participant shall have credited to his or her Stock
Unit Account an additional number of Stock Units equal to: the per-share cash
dividend payable with respect to a Share on such dividend payment date
multiplied by the number of Stock Units held in the Stock Unit Account as of the
close of business on the record date for such dividend divided by the Fair
Market Value of a Share on such dividend payment date.   If dividends are paid
on Shares in a form other than cash, then such dividends shall be notionally
converted to cash, if their value is readily determinable, and credited in a
manner consistent with the foregoing and, if their value is not readily
determinable, shall be credited "in kind" to the Participant's Stock Unit
Account.

                                  ARTICLE VII

                           SETTLEMENT OF STOCK UNITS
                           -------------------------

     7.1   Settlement of Account.    The Company will settle a Participant's
           ---------------------
Stock Unit Account in the manner described in Section 7.2 as soon as
administratively feasible following the earlier of (i) notification of such
Participant's Termination of Service or (ii) the Termination Date.

     7.2   Payment Options.     An election filed under Article VI shall specify
           ---------------
whether the Participant's Stock Unit Account is to be settled by delivering to
the Participant (or his or her beneficiary) the number of Shares equal to the
number of whole Stock Units then credited to the Participant's Stock Unit
Accounts, in (a) a lump sum, or (b) substantially equal annual installments over
a period not to exceed three (3) years.  If, upon lump sum distribution or final
distribution of an installment, less than one whole Stock Unit is credited to a
Participant's Stock Unit Account, cash will be paid in lieu of fractional shares
on the date of such distribution.

     7.3   Continuation of Dividend Equivalents.    If payment of Stock Units is
           ------------------------------------
deferred and paid in installments, the Participant's Stock Unit Account shall
continue to be credited with dividend equivalents as provided in Section 6.5.

     7.4   In Kind Dividends.    If any "in kind" dividends were credited to the
           -----------------
Participant's Stock Unit Account under Section 6.5, such dividends shall be
payable to the Participant in full on the date of the first distribution of
Shares under Section 7.2.

                                 ARTICLE VIII

                                UNFUNDED STATUS
                                ---------------

     The interest of each Participant in any Fees deferred under this Plan (and
any Stock Units or Stock Unit Account relating thereto) shall be that of a
general creditor of the Company.  Stock Unit Accounts, and Stock Units (and, if
any, "in kind" dividends) credited thereto, shall at all times be maintained by
the Company as bookkeeping entries evidencing unfunded and unsecured general
obligations of the Company.
<PAGE>

                                  ARTICLE IX

                          DESIGNATION OF BENEFICIARY
                          --------------------------

     Each Participant may designate, on a form provided by the Committee, one or
more beneficiaries to receive the Shares described in Section 7.2 in the event
of such Participant's death.  The Company may rely upon the beneficiary
designation last filed with the Committee, provided that such form was executed
by the Participant or his or her legal representative and filed with the
Committee prior to the Participant's death.

                                   ARTICLE X

                             ADJUSTMENT PROVISIONS
                             ---------------------

     In the event any recapitalization, reorganization merger, consolidation,
spin-off, combination, repurchase, exchange of shares or other securities of the
Company, stock split or reverse split, or similar corporate transaction or event
affects Shares such that an adjustment is determined by the Company Board or
Committee to be appropriate to prevent dilution or enlargement of Participants'
rights under this Plan, then the Company Board or Committee will, in a manner
that is proportionate to the change to the Shares and is otherwise equitable,
adjust the number or kind of Shares to be delivered upon settlement of Stock
Unit Accounts under Article VII.

                                   ARTICLE XI

                               GENERAL PROVISIONS
                               ------------------

     11.1   No Right to Continue as a Director.    Nothing contained in this
            ----------------------------------
Plan will confer upon any Participant any right to continue to serve as a
Director.

     11.2   No Shareholder Rights Conferred.    Nothing contained in this Plan
            -------------------------------
will confer upon any Participant any rights of a shareholder of the Company
unless and until Shares are in fact issued or transferred to such Participant in
accordance with Article VII.

     11.3   Change to the Plan.    The Company Board may amend, alter, suspend,
            ------------------
discontinue, extend, or terminate the Plan without the consent of the
Participants; provided, however, that, without the consent of an affected
Participant, no such action may materially impair the rights of such Participant
with respect to any Stock Units credited to his or her Stock Unit Account.

     11.4   Consideration; Agreements.    The consideration for Shares issued or
            -------------------------
delivered in lieu of payment of Fees will be the Director's service during the
period to which the Fees paid in the form of Shares related.

     11.5   Compliance with Laws and obligations.    The Company will not be
            ------------------------------------
obligated to issue or deliver Shares in connection with this Plan in a
transaction subject to the registration requirements of the Securities Act of
1933, as amended, or any other federal or  state securities law, any requirement
under any listing agreement between the Company and any national securities
exchange or automated quotation system or any other laws, regulations, or
contractual obligations of the Company, until the Company is satisfied that such
laws, regulations, and other obligations of the Company have been complied with
in full.   Certificates representing Shares delivered under the Plan will be
subject to such stop-transfer orders and other restrictions as may be applicable
under such laws, regulations, and other obligations of the Company, including
any requirement that a legend or legends be placed thereon.

     11.6   Limitations on Transferability.    Stock Units and any other right
            ------------------------------
will not be transferable by a Participant except by will or the laws of descent
and distribution (or to a designated beneficiary in the event of a Participant's
death). Stock Units and other rights under the Plan may not be pledged,
mortgaged, hypothecated, or otherwise encumbered, and shall not be subject to
the claims of creditors.

     11.7   Governing Law.    The validity, construction, and effect of the Plan
            -------------
and any agreement hereunder will be determined in accordance with the laws of
the State of Oklahoma, without giving effect to principles of conflicts of laws,
and applicable federal law.

     11.8   Plan Termination.    Unless earlier terminated by action of the
            ----------------
Company Board, the Plan will remain in effect until the earlier of (i) such time
as no Shares remain available for delivery under the Plan and the Company has no
further rights or obligations under the Plan or (ii) June 30, 2004.

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