AP02 Car Servo Brake, 8 Inches, Compatible with Bel Air Nomad 150 210 Series 1955-1957 Features: - 8-inch dual zinc servo brake with Bail master cylinder - Ideal for most small to medium-sized street rods and customs - Booster mounts with a 4-bolt pattern - Bolts are spaced in a square, 3 3/8" center-to-center - Master cylinder has a 1-inch bore with 9/16" and 1/2" ports - Works with drum/drum, disc/drum, or disc/disc configurations - Kit is compatible with disc/drum applications only Compatible Models: - 1955-1957 Bel Air - 1955-1957 Nomad - 1955-1957 One-Fifty Series - 1955-1957 Two-Ten Series Package Includes: - 1-inch bore master cylinder - 8-inch dual zinc servo brake - Disc/drum proportioning valve kit - Mounting hardware set Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.