Every vehicle owned or leased by the state shall display vehicle license tags. The color, numbering system or systems and lettering on such license tags and all other specifications thereof together with procedures for display thereof, and special provisions for registration fees and license tags of leased vehicles, shall be in accordance with rules and regulations adopted by the secretary of administration as provided in Kan. Stat. Ann. §§ 75-3706 and amendments thereto. Such license tags shall be provided upon requisition of the secretary of administration for all motor vehicles of the central motor pool. Such license tags for vehicles not in the central motor pool shall be provided upon the requisition of the head of each state agency for the vehicles owned or leased by such state agency. Such license tags shall be replaced from time to time as the same may become less than plainly legible upon requisition as above provided.