This bumper is designed to be used with stock '74 and on 911, SC and Carrera fenders (Bexco Automotive Part #30). The oil cooler opening is 23 1/2" x 6 1/8". The bumper has brake cooling ducts and provisions for lights. Mounting hardware is included. Average weight is 9 lbs. Bexco Automotive also recommends buying the grill (part #43C). Call for carbon fiber prices.