New 7" Dual Diaphragm zinc plated power brake booster, master cylinder and Adjustable Proportioning Valve. This 7" power booster is hand polished before a yellow zinc finish is applied for a top quality finish. The top quality power brake booster is designed mount directly to your factory firewall. Also included in this kits is a new 1-1/8" bore master cylinder and Adjustable Proportioning Valve equipped to work with disc/drum or disc/disc applications. Master Cylinder Bore Size: 1-1/8 in, Bowl Design: Dual Bowl, Master Cylinder Material: Cast Iron, Master Cylinder Finish: Natural, Reservoir Included: Yes, Reservoir Material: Cast Iron, Master Cylinder Cap Included: Yes, Brake Booster Type: Dual Diaphragm, Brake Booster Diameter (in): 7 Booster Material: Steel, Brake Booster Finish: Zinc, Brake Pedal Rod Extension Included: Yes, Mounting Hardware Included: Uses Original, Quantity: Kit.