Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4911 and 74-4913, and amendments to these sections, to the contrary, an employee who became a member of the Kansas public employees retirement system on January 18, 1981, and who was first employed by a participating employer from June 1945 through January 15, 1948, shall be entitled to receive, upon retirement, prior service credit for such employment prior to January 1, 1962, and the membership date shall be amended to January 1, 1978, and participating service shall be granted for the period of January 1, 1978, to January 18, 1981, upon receipt of the appropriate employee and employer contributions.