Okla. Stat. tit. 20, § 1109

The term "Justice or judge," as used in connection with judicial retirement, shall include the Administrative Director of the Courts. The person holding that constitutional office at the effective date of this act may secure credit for his prior years of service with the judiciary by paying, within thirty (30) days of the effective date of this act, the amount of contributions he would have paid to the Judicial Retirement System had he been a member thereof since January 13, 1969. He shall not participate in any other state retirement system but may withdraw all his contributions paid to the general employees retirement system.