The booster mounts with a 4-bolt pattern. The master cylinder in this kit is the Bail Top style and features a 1 1/8" bore. This master has ports on both sides (9/16" and 1/2") and includes plugs to block the unused ports (4 Ports Total).
1955 56 57 CHEVY 210 BEL AIR REAR 1" DROP LOWERING BLOCKS U BOLTS COMPLETE KIT
1955 56 57 Chevy 8" Dual Brake Booster + Master Cylinder & Bracket Kit DISC DISC
1955 56 57 Chevy 8" Dual Brake Booster + Master Cylinder & Bracket Kit DRUM DRUM
1955 56 57 Chevy Tri 5 9" Chrome Power Brake Booster Bel Air 150 Tri Five RETURN
1955 56 57 Chevy Tri 5 Chrome Power Brake Booster Master Cylinder Disc Disc Kit
1955 56 57 Chevy Tri 5 Bel Air 150 210 Brake Booster Firewall Mounting Bracket