This bumper is designed to be used for stock '74-on 911, SC, or Carrera stock width fenders. The bumper has an oil cooler opening of 23 1/2" x 6 1/8", brake cooling ducts, provisions for lights and a built in splitter. Mounting brackets are included. Fits GT Racing fenders or stock 911 narrow body fender, (part #30). Average weight is 10 lbs. Note: GT Racing also recommends buying the grill (part #43C) and for additional down-foce you can add an additional splitter/undertray (part #44C). Call for carbon fiber prices.