Document:

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                                                                    Exhibit 10.4

                               AMENDMENT NUMBER 3
                                       TO
                              WILLBROS GROUP, INC.
                                 1996 STOCK PLAN

      1.    Introduction. On April 16, 1996, the Board of Directors of Willbros
Group, Inc. (the "Company") adopted, and on May 21, 1996, the stockholders of
the Company approved, the Willbros Group, Inc. 1996 Stock Plan (as amended, the
"Plan"). The Plan permits the granting of awards, including stock options, to
key employees (including officers and directors who are employees) of the
Company or its subsidiaries.

            Under the terms of the Plan, a total of 3,125,000 shares of Common
Stock of the Company are available for issuance pursuant to awards granted under
the Plan (subject to adjustment in the event of certain corporate transactions
such as a stock split, etc.).

            The Plan includes various provisions with respect to the exercise of
awards if a participant's employment with the Company terminates for various
reasons, including death, disability or retirement. As a result of the Company's
termination of its defined benefit retirement plans, the definition of the term
"Retirement" in the Plan needs to be amended.

      2.    Purpose. The sole purpose of this Amendment is to replace the
definition of the term "Retirement" in the Plan with a new definition, which
will provide clarity with respect to the meaning of such term for all awards
granted under the Plan after the effective date of this Amendment. Awards
granted prior to the effective date of this Amendment shall continue to be
subject to the definition of the term "Retirement" prior to its amendment
hereunder.

      3.    Amendment. Solely with respect to awards which are granted under the
Plan on or after the effective date hereof, in Section 2 of the Plan, the
definition of the term "Retirement" is deleted and the following definition of
the term "Retirement" is substituted therefor:

            "'Retirement' means the voluntary termination of employment with the
            Company or any of its Subsidiaries by a Participant who is at least
            62 years of age and has a minimum of four consecutive years of
            continuous service with the Company or any of its Subsidiaries."

      4.    No Change. Except as specifically set forth herein, this Amendment
does not change the terms of the Plan.

      5.    Effective Date. This Amendment shall take effect and be adopted as
of January 1, 2004.

      Executed as of the 1st day of January, 2004.

ATTEST:                                    WILLBROS GROUP, INC.

 /s/  Dennis G. Berryhill                  By: /s/  Michael F. Curran
----------------------------                   -------------------------------
Dennis G. Berryhill                            Michael F. Curran
Secretary                                      President and Chief
                                                 Executive Officer<PAGE>

                                                                    Exhibit 10.5

                               AMENDMENT NUMBER 3
                                       TO
                              WILLBROS GROUP, INC.
                              DIRECTOR STOCK PLAN

      1.    Introduction. On April 16, 1996, the Board of Directors of Willbros
Group, Inc. (the "Company") adopted, and on May 21, 1996, the stockholders of
the Company approved, the Willbros Group, Inc. Director Stock Plan (as amended,
the "Plan").

            The Plan provides for the automatic grant of non-qualified stock
options to non-employee directors of the Company. Under the terms of the Plan,
an initial option to purchase 5,000 shares of common stock of the Company is
granted to each new non-employee director on the date such director is elected
or appointed to the Board of Directors of the Company. Each non-employee
director also receives annually an option to purchase 5,000 shares of common
stock of the Company on the annual anniversary of the date on which such
director received an initial option and on each succeeding annual anniversary of
such date during the period of such director's incumbency (the "Annual Stock
Option Grant").

      2.    Purpose. The sole purpose of this Amendment is to change the timing
of the Annual Stock Option Grant to the same date for all non-employee directors
eligible to receive same.

      3.    Amendment. In Section 6(b) of the Plan, the words "On each
anniversary of the Initial Grant Date" are deleted and the following words are
substituted therefor:

            "On the second Monday in January of each year".

      4.    No Change. Except as specifically set forth herein, this Amendment
does not change the terms of the Plan.

      5.    Effective Date. This Amendment shall take effect and be adopted as
of January 1, 2004.

      Executed as of the 1st day of January, 2004.

ATTEST:                                WILLBROS GROUP, INC.

By: /s/  Dennis G. Berryhill           By: /s/ Michael F. Curran
    ---------------------------            ------------------------------
    Dennis G. Berryhill                    Michael F. Curran
    Secretary                              President and Chief Executive Officer<PAGE>

                                                                    Exhibit 10.6

                              WILLBROS GROUP, INC.

                        RESTRICTED STOCK AWARD AGREEMENT

                                     [DATE]

[Name]
[Address]
[Address]

Dear __________________:

      1.    RESTRICTED STOCK AWARD. Willbros Group, Inc., a Republic of Panama
corporation (the "Company"), hereby grants to you an aggregate of ______ shares
of Common Stock, par value $.05 per share, of the Company (the "Restricted
Shares"). This award is subject to your acceptance of and agreement to all of
the applicable terms, conditions, and restrictions described in the Company's
1996 Stock Plan, as amended (the "Plan"), a copy of which, along with the
Prospectus for the Plan, are attached hereto, and to your acceptance of and
agreement to the further terms, conditions, and restrictions described in this
Restricted Stock Award Agreement (this "Award Agreement"). To the extent that
any provision of this Award Agreement conflicts with the expressly applicable
terms of the Plan, it is hereby acknowledged and agreed that those terms of the
Plan shall control and, if necessary, the applicable provisions of this Award
Agreement shall be hereby deemed amended so as to carry out the purpose and
intent of the Plan.

      2.    POSSESSION OF CERTIFICATES. The Company shall issue a certificate or
certificates for the Restricted Shares in your name and shall retain the
certificate(s) for the period during which the restrictions described in Section
4(b) are in effect. You shall execute and deliver to the Company a stock power
or stock powers in blank for the Restricted Shares. You hereby agree that the
Company shall hold the certificate(s) for the Restricted Shares and the related
stock power(s) pursuant to the terms of this Award Agreement until such time as
the restrictions described in Section 4(b) lapse as described in Section 5 or
the Restricted Shares are canceled pursuant to the terms of Section 4(b).

      3.    OWNERSHIP OF RESTRICTED SHARES. You shall be entitled to all the
rights of absolute ownership of the Restricted Shares, including the right to
vote such shares and to receive dividends therefrom if, as, and when declared by
the Company's Board of Directors, subject, however, to the terms, conditions,
and restrictions described in the Plan and in this Award Agreement.

<PAGE>

      4.    RESTRICTIONS.

            (a)   Your ownership of the Restricted Shares shall be subject to
the restrictions set forth in subsection (b) of this Section until such
restrictions lapse pursuant to the terms of Section 5, at which time the
Restricted Shares shall no longer be subject to the applicable restrictions.

            (b)   The restrictions referred to in subsection (a) of this Section
are as follows:

                  (1)   At the time of your "Termination of Employment" (as
            defined in Section 10(b)), other than a Termination of Employment
            that occurs as a result of an event described in Section 5(b)(1) or
            a Termination of Employment that is described in Section 5(b)(2),
            you shall forfeit the Restricted Shares to the Company and all of
            your rights thereto shall terminate without any payment of
            consideration by the Company. If you forfeit any Restricted Shares
            and your interest therein terminates pursuant to this paragraph,
            such Restricted Shares shall be canceled.

                  (2)   You may not sell, assign, transfer, pledge, hypothecate,
            or otherwise dispose of the Restricted Shares.

      5.    LAPSE OF RESTRICTIONS.

            (a)   The restrictions described in Section 4(b) shall lapse with
respect to _____ of the Restricted Shares on the first anniversary of the date
hereof, another _____ of the Restricted Shares on the second anniversary of the
date hereof, another _____ of the Restricted Shares on the third anniversary of
the date hereof, and the last _____ of the Restricted Shares on the fourth
anniversary of the date hereof. Following the lapse of such restrictions with
respect to any Restricted Shares, such Restricted Shares shall no longer be
subject to the restrictions described in Section 4(b).

            (b)   Notwithstanding the provisions of subsection (a) of this
Section, the restrictions described in Section 4(b) shall lapse with respect to
all the Restricted Shares at the time of the occurrence of any of the following
events:

                  (1)   Your death, "Disability" (as defined in the Plan) or
            "Retirement" (as defined in Section 10(c));

                  (2)   Your Termination of Employment, but only if such
            Termination of Employment is the result of a dismissal or other
            action by the Company or any of its Subsidiaries and does not
            constitute a "Termination for Cause" (as defined in Section 10(a));
            or

                  (3)   A "Change of Control" (as defined in the Plan) of the
            Company.

      6.    AGREEMENT WITH RESPECT TO TAXES. You agree that (a) you will pay to
the Company or a Subsidiary, as the case may be, or make arrangements
satisfactory to the Company or such Subsidiary regarding the payment of any
foreign, federal, state, or local taxes

                                        2
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of any kind required by law to be withheld by the Company or any of its
Subsidiaries with respect to the Restricted Shares (provided, however, that you
shall not be entitled or permitted to satisfy this obligation by the Company's
withholding of stock that is subject to this Award Agreement or by your transfer
of other shares of stock to the Company or a Subsidiary) and (b) the Company or
any of its Subsidiaries shall, to the extent permitted by law, have the right to
deduct from any payments of any kind otherwise due to you any foreign, federal,
state, or local taxes of any kind required by law to be withheld with respect to
the Restricted Shares.

      7.    ADJUSTMENT OF SHARES. The number of Restricted Shares subject to
this Award Agreement shall be adjusted as provided in Section 13 of the Plan.
Any shares or other securities received by you as a stock dividend on, or as a
result of stock splits, combinations, exchanges of shares, reorganizations,
mergers, consolidations or otherwise with respect to the Restricted Shares shall
have the same terms, conditions and restrictions and bear the same legend as the
Restricted Shares.

      8.    AGREEMENT WITH RESPECT TO SECURITIES MATTERS. You agree that you
will not sell or otherwise transfer any Restricted Shares except pursuant to an
effective registration statement under the U.S. Securities Act of 1933, as
amended, or pursuant to an applicable exemption from such registration.

      9.    RESTRICTIVE LEGEND. You hereby acknowledge that the certificate(s)
for the Restricted Shares will bear a conspicuous legend referring to the terms,
conditions, and restrictions described in the Plan and this Award Agreement. Any
attempt to dispose of any Restricted Shares in contravention of the terms,
conditions, and restrictions described in the Plan or this Award Agreement shall
be ineffective.

      10.   CERTAIN DEFINITIONS. As used in this Award Agreement, the following
terms shall have the respective meanings indicated:

            (a)   "Termination for Cause" shall mean a Termination of Employment
as a result of (1) your willful and continued failure substantially to perform
your duties (other than any such failure resulting from your incapacity due to
physical or mental illness), (2) your conviction for a felony, proven or
admitted fraud, misappropriation, theft or embezzlement by you, your inebriation
or use of illegal drugs in the course of, related to or connected with the
business of the Company or any of its Subsidiaries, or your willful engaging in
misconduct that is materially injurious to the Company or any of its
Subsidiaries, monetarily or otherwise, or (3) if you have entered into an
employment agreement or contract with the Company or any of its Subsidiaries,
any other action or omission that is identified in such agreement or contract as
giving rise to "Cause" for the termination of your employment with the Company
or any of its Subsidiaries. For this purpose, no act, or failure to act, on your
part shall be considered "willful" unless done, or omitted, by you not in good
faith and without reasonable belief that your action or omission was in the best
interest of Company or any of its Subsidiaries.

            (b)   "Termination of Employment" shall mean the termination of your
full-time employment with the Company or any of its Subsidiaries for any reason
other than your death, Disability or Retirement.

                                        3
<PAGE>

            (c)   "Retirement" shall mean the voluntary termination of your
full-time employment with the Company or any of its Subsidiaries after you are
at least 62 years of age and have a minimum of four consecutive years of
continuous service with the Company or any of its Subsidiaries.

      Capitalized terms used in this Award Agreement and not otherwise defined
herein shall have the respective meanings provided in the Plan.

      If you accept this Restricted Stock Award and agree to the foregoing terms
and conditions, please so confirm by signing and returning the duplicate copy of
this Award Agreement enclosed for that purpose.

                                        WILLBROS GROUP, INC.

                                        By:_____________________________________
                                           Name:________________________________
                                           Title:_______________________________

      The foregoing Restricted Stock Award is accepted by me as of the ___th day
of _______, 200__, and I hereby agree to the terms, conditions, and restrictions
set forth above and in the Plan.

                                        ________________________________________
                                        [Name]

                                        4

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