This one piece duplicate of the factory RS bumper is designed to be used with 9" rear quarter panels (SC, ST, Carrera). It is designed with shorter bumperettes and dual exhaust cut outs. It can also be used on "69-"73 stock body cars (See instructions on web site). Average Weight is 8 LBS. Fits Bexco Automotive rear fenders (part #35-9, #36).