Document:

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                                                                    EXHIBIT 10.3

                                                                  CONFORMED COPY

                                 WESTLAKE GROUP

                              PERFORMANCE UNIT PLAN

                                   ----------

                            EFFECTIVE JANUARY 1, 1991

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                                                                    CONFIDENTIAL

                                 WESTLAKE GROUP

                              PERFORMANCE UNIT PLAN

                                   ----------

                            EFFECTIVE JANUARY 1, 1991

1.0 PURPOSE

         1.1      The objective of the Westlake Group Performance Unit Plan (The
                  Plan) is to reward selected Key Employees with a piece of the
                  future of the Company whose value the Key Employees help to
                  enhance.

         1.2      The Plan is designed to provide selected Key Employees with a
                  sense of ownership in the Company and an opportunity to
                  benefit from the increase in the value of the Company and thus
                  to aid in attracting and retaining Key Employees.

2.0 ADMINISTRATION

         2.1      The Chairman's Office (CO) shall have total and complete
                  discretion to determine who receives Performance Units (PUs);
                  the amount and value of PUs; and the time of issuance of PUs.

         2.2      No decision by CO shall be considered an ongoing rule or
                  regulation unless so expressly stated by CO.

         2.3      Decisions and determinations of CO shall be final and binding
                  on all parties.

3.0 VALUATION OF PUs

         3.1      PU will be assigned a base value of $1.00.

         3.2      PU will entitle Key Employee (when eligible to exercise) to a
                  payment measured as follows:

<Table>
<S>               <C>
                               Book Value at Exercise Valuation Date -- Book Value at Grant Date
                  Cash Value = ----------------------------------------------------------------- x $1.00 x # of Vested Units
                                                   Book Value at Grant Date
</Table>

         3.3      Book Value to be defined by CO and determined on an annual
                  basis and shall exclude any new infusions of capital or
                  increases in capital through any mergers with any other
                  company during the period between the grant date and the date
                  of exercise.

         3.4      Each new grant will be based upon the book value as of the
                  date of the new grant.

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         3.5      At the discretion of the CO, a dividend may be withdrawn at
                  any time which may reduce the original book value base for any
                  grant year. To maintain the same growth ratio as if the
                  dividend had been left in the business, the following ratio
                  will be applied to the book value at the exercise date. In the
                  event of multiple dividend withdrawals during the life of the
                  grant, this ratio will be applied each time so that the rate
                  of growth that otherwise may have occurred without the
                  withdrawals will remain the same.

                    Ratio (R) =  Book Value Before Dividend Withdrawal (W/D)
                                 -------------------------------------------
                                    Book Value Before W/D  --  W/D Amount

4.0 EXERCISE OF PU RIGHTS

         4.1      Vested PUs can only be converted to cash during April of each
                  calendar year.

         4.2      Conversion of PUs to cash extinguishes all rights associated
                  with such converted PUs.

         4.3      Upon an initial public offering of stock in any Westlake
                  companies, a participant will be allowed to convert the value
                  of unexercised PUs into common stock on a basis more favorable
                  than the public offering price as determined by CO.

5.0 VESTING & AWARD CONDITIONS

         5.1      50% of PUs awarded in each grant shall be vested 2 years after
                  the date of award (vesting date) if the employee is still
                  employed by Westlake at such time. Vested PUs are exercisable
                  in any April following the vesting date.

         5.2      Remaining 50% of PUs awarded in each grant shall be vested 7
                  years after date of award if employee is still employed by
                  Westlake at such time. Vested PUs are exercisable in any April
                  following the vesting date.

         5.3      Key employees awarded PUs under the 1990 grant of the plan
                  shall be vested in 50% of PUs after 1 year from the date of
                  award and 50% after 6 years. All subsequent grants will follow
                  the vesting schedule above.

         5.4      If employment of participant terminates other than for death,
                  disability, or normal retirement, participant may only
                  exercise any vested PUs during the next exercise period.
                  Failure to exercise during the next exercise period will
                  result in the forfeiture of vested PUs.

         5.5      All non-vested PUs held at termination of employment except in
                  the case of death or disability or normal retirement shall be
                  forfeited.

         5.6      Upon total and permanent disability as determined by CO or
                  upon death or normal retirement of a participant, all PUs
                  become vested immediately and shall be automatically exercised
                  during the next exercise period. In the case of death, the
                  proceeds will be distributed to the participant's designated
                  beneficiary.

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         5.7      All PUs must be exercised within 10 years of award pursuant to
                  IRS guidelines.

6.0 CHANGE OF OWNERSHIP

         6.1      In case of more than a 50% change in ownership of the stock or
                  underlying assets of Westlake, a provision in the plan as
                  determined by the CO will protect the rights of participants
                  in previously granted awards, or the plan may be terminated
                  with all outstanding vested units becoming eligible for
                  exercise at a date as determined by CO.

7.0 LIMITATION OF LIABILITIES

         7.1      CO reserves the right at any time to amend or terminate the PU
                  Plan; but such action shall not adversely affect any plan
                  participant (or beneficiary) with respect to vested PUs
                  previously awarded and then any outstanding units at such
                  termination will become exercisable at a date as determined by
                  CO.

         7.2      CO and Westlake Group of Companies shall not be liable to plan
                  participants or beneficiaries for any decision, action or lack
                  of action taken in connection with the PU Plan.

         7.3      The Plan shall not establish any right on the part of
                  employees to receive PUs except as solely determined by CO.

         7.4      The Plan shall not give any employee or any other persons any
                  rights or interest in any specific asset or assets of a
                  Westlake Company.

         7.5      The Plan shall not in any way be evidence of any agreement or
                  understanding, express or implied, that a Westlake Company
                  will employ a plan participant in any particular position or
                  at any specific rate of pay.

8.0 TAX CONSIDERATIONS

         8.1      Company is not allowed a current deduction for awards of PUs
                  based upon current IRS guidelines.

         8.2      Employees have no taxable income until PUs are exercised or
                  deemed exercised at date of expiration.

         8.3      Company gets a tax deduction for its taxable year which
                  includes last day of employee's tax year in which the
                  employee's payments becomes taxable.

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9.0 BENEFICIARY

         9.1      Each participant should select a beneficiary to receive
                  payments payable at the first exercise period following the
                  Key Employee's death.

                                      APPROVED:      /s/ James Chao
                                                 ----------------------
                                                 James Chao - President

                                      DATE:             1/24/92
                                                 ----------------------<PAGE>

                                                                    EXHIBIT 10.4

December 10, 1999

Mr. Warren Wilder
6645 Westchester
Houston, TX  77005

Dear Warren:

On behalf of the Westlake Group I am pleased to confirm our offer to you to join
Westlake Management Services Corporation. The provisions of this offer are
summarized below.

POSITION:                  Vice President, Planning & Business Development

LOCATION:                  Houston, Corporate Office

REPORTING:                 You will report to the Chairman's Office.

BASE PAY:                  $165,000 per year.

QUARTERLY INCENTIVE:       You will become eligible for participation in the
                           Quarterly Incentive Plan. This plan currently has a
                           maximum payment of 2% of annual base pay per quarter.

MANAGEMENT BONUS:          In this position you will be eligible for
                           participation in the annual Management Incentive
                           bonus program. Your target bonus will be 40%. As
                           discussed the actual payment will be conditioned on
                           the performance of the company and your individual
                           contributions and may be higher or lower than the
                           target.

SIGN ON:                   As an incentive for you to accept our offer you will
                           be paid a signing bonus of $100,000. This will be
                           paid at the rate of $40,000 upon employment and
                           $30,000 on January 1, 2001; and $30,000 on January 1,
                           2002.

LONG TERM INCENTIVE:       You will be eligible for awards under the provisions
                           of the Performance Unit Plan (PUP) with a target
                           grant equal to 40%. In this regard you will be
                           provided an initial grant of units at the date of
                           hire in an amount equal to a projected cash value of
                           40% of your base salary based upon the provisions of
                           the plan.

VACATION:                  You will be eligible for 3 weeks vacation during
                           2000. Beginning in 2001 you will become eligible for
                           4 weeks vacation.

PROFIT SHARING:            You will be eligible for any profit sharing payments
                           made to employees at the discretion of the Chairman's
                           Office.

BENEFITS:                  You will be eligible for all benefits provided to
                           regular, full-time employees of Westlake Management
                           Services pursuant to the terms and conditions of the
                           plan documents, as summarized in the packet provided
                           to you earlier for your review.

CLUB:                      You will become eligible for membership in the
                           University Club under our Corporate Membership Plan.
                           This will entitle you to athletic and dining
                           privileges.

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START DATE:                We would hope to have you on board no later than
                           February 1, 2000. We can discuss the actual timing
                           and logistics over the next few days.

TERM OF EMPLOYMENT:        Your employment with Westlake will be on an at-will
                           basis without promissory or contractual rights to
                           retention. However, in the event of your involuntary
                           termination, other than for cause, death, retirement
                           or disability, you will be provided with the
                           following:

                               1.   12 months base pay at the then current rate.

                               2.   An amount equal to the target bonus at the
                                    then current percentage, times the corporate
                                    performance factor as determined at the next
                                    bonus calculation period.

                               3.   Continuation of health care benefits for a
                                    period equal to 12 months.

Warren, this offer is contingent upon the following.

         -        The successful completion of a drug-screen. Arrangements will
                  be made to complete this as soon as possible. Linda Taylor
                  from my office will make arrangements through our HR
                  Department to assist you in this regard.

         -        Verification of your eligibility to work in the United States
                  under the provisions of the Immigration and Naturalization
                  Services guidelines. (verified at employment)

         -        Completion of all pre-employment reference and background
                  checks, including a credit check.

We are excited that you have elected to join us and look forward to many years
of working with you as we continue to build the Westlake team. Once you have
completed your review of the summary above please acknowledge your acceptance by
signing below and returning a copy to my attention.

Best regards,

/s/ David R. Hansen
David R. Hansen
Sr. Vice President, Administration

AGREED:

/s/ Warren Wilder
------------------------
Warren Wilder

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