Notwithstanding the provisions of Kan. Stat. Ann. § 74-4913, 74-4936, 74-4956, 74-4994 and 74-49,103, and any amendments to such statutes, to the contrary, any member of the Kansas public employees retirement system or any other retirement plan under the laws of this state whose date of birth is June 30, 1921, and who has a minimum of seven years service credit shall receive prior service credit under the Kansas public employees retirement system for any service as a member of the Kansas legislature which is not otherwise credited under the Kansas public employees retirement system, except that in no event, shall any such individual receive credit for any legislative service for a period in which such individual elected not to participate in the Kansas public employees retirement system while such individual served in the legislature or for any legislative service for which such individual had previously received credit and forfeited it as a result of withdrawal of contributions. If a prior service salary is not otherwise available or has not been established under the Kansas public employees retirement system for any individual receiving credit under this section, the prior service salary shall be the total compensation received as a member of the legislature in the last full year of service as a member of the legislature.