This 1955-1956 Chevy Power Brake Standard Clutch Swing Pedal Assembly is a modified version of the original. GM never made a power brake and standard clutch assembly. It was either a standard brake and clutch OR power brake with automatic transmission. But why not have the best of both worlds? The swing assemblies have been modified so that they accept the power brake booster. The setup includes everyting BUT the booster. POWER BRAKE BOOSTERS ARE SOLD SEPARATELY. THESE ARE MADE ON A PER ORDER BASIS. Please allow 1-2 weeks to fulfill the order. Call about getting a core credit for sending us your clutch swing pedal assembly.