Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4911 and 74-4913 to the contrary, an employee of a participating employer who was first employed by said employer in the month of July, 1949 until July, 1959, and who was again employed by said participating employer March 2, 1970, and who is employed by said participating employer on the effective date of this act, shall be an eligible member of the Kansas public employees retirement system as of March 1, 1970, upon the payment of appropriate employer and employee contributions, and shall be entitled to receive participating service credit for employment with said participating employer, from said date of membership. Upon attainment of membership by the provisions of this act, such employee shall receive prior service credit for all service from July, 1949 until July, 1959. The prior service benefit shall be computed by using a prior service annual salary of two thousand four hundred sixty-eight dollars ($2,468).