These Kirkey 55 Series Aluminum Seats replace the 41 Series Seats. These seats are designed for all drag cars, pro street, and door slammers. Offset aluminum extrusion around perimeter of seat allows added strength and safety. Features: Reinforced head rest Front of seat raised for added leg and thigh support Seat comes standard with double shoulder belt openings and sub belt openings to accommodate all belt systems Molded rubber inserts for all belt openings Seat bottom allows seat to be mounted in a wide range of layback angles without raising center of gravity of the race car The 18-1/2" and 20" sizes feature longer bottom, sub belt and lap belt openings moved forward, side bolsters and rear belt openings raised to accommodate larger drivers Easy installation Seat cover included