Brake booster and master cylinder for disc brakes Fits Compatible with Chrysler 1963-1974 A, B, & E Body. This is an 8" dual diaphragm booster and a 15/16 inch bore master cylinder. This works with a factory manual brake pedal We welcome any and all of your questions. Kit includes: 1- 8 inch dual diaphragm booster 1- mounting bracket for booster pedal attachment has some adjustment 1 - master cylinder 15/16 bore