New 9" slim line direct fit power brake booster. This top quality power brake booster is designed mount directly to your factory firewall. This power booster works great as a factory replacement for power brake vehicles. Master Cylinder Bore Size: N/A, Bowl Design: N/A, Master Cylinder Material: N/A, Master Cylinder Finish: N/A, Reservoir Included: N/A, Reservoir Material: N/A, Master Cylinder Cap Included: N/A, Brake Booster Type: Single Diaphragm, Brake Booster Diameter (in): 9 Booster Material: Steel, Brake Booster Finish: Black, Brake Pedal Rod Extension Included: Yes, Mounting Hardware Included: N/A, Quantity: Each.