This one piece duplicate of the factory stock Porsche 911 RS bumper is designed to be used with 9" rear quarter panels (SC, Carrera etc.). It is designed with the original larger bumperettes. It can also be used on '69-'73 stock body cars by pushing in the outside edges of the bumper slightly. Average Weight 9 lbs. Fits GT Racing quarter/flares (part #35-9, #36).