Brake Booster: 8" Dual Diaphragm (Universal)This universal 8" dual diaphragm power brake booster features an adjustable master cylinder pin and is designed for flush mounting without included brackets, though brackets can be supplied if required. Connectors to your brake pedal are necessary. The piston reach suits primarily '69 and later master cylinders with standard shallow piston pin depth. No rear brackets are includedonly four bolt flat panel studs. Optional zinc chromate finished angled