Finally, an all bolt on Disc Brake bracket for the GM 14 bolt single rear wheel full float axles manufactured before 1988, which does not use spacers! This disc brake bracket is made from 3/8" bent US plate steel. The brackets are prebent and tapped to accept 1975 3/4 ton front Chevrolet rotors (Napa Part Number 4885677) and calipers (Napa Part Number CAL N4597 and CAL N4596). Disc brakes have a lot of advantages over drums. They decrease stopping distance by as much as 30%. They also do not clog with mud and other debris. Disc brakes systems can also weigh as much as 100 lb less than drum systems. Your brakes are one area that you do not want any inadequacies. Like all of our products, they are made in the USA from USA steel. Sold In Pairs