Okla. Stat. tit. 63, § 686.13

When an emergency interim successor exercises the powers and assumes the duties of a legislator, the emergency interim successor shall be accorded the privileges and immunities, compensation, allowances and other perquisites of office to which a legislator is entitled. In the event of an emergency or disaster, each emergency interim successor, whether or not called upon to exercise the powers and assume the duties of a legislator, shall be accorded the privileges and immunities of a legislator while traveling to and from a place of session and shall be compensated for travel in the same manner and amount as a legislator. This section shall not in any way affect the privileges, immunities, compensation, allowances or other perquisites of office of an incumbent legislator.