The booster mounts with a 4-bolt pattern. The 4 bolts are in a perfect square and are 3 3/8" apart (center to center). This master cylinder will work with any drum/drum, disc/drum, or disc/disc setup.
Impala Power Booster + Bail Top Master Cylinder & Straight Bracket Kit W/PV2
Chrome Impala 8"Power Booster + Bail Top Master Cylinder & Straight Bracket Kit
Chrome Impala 9" Power Booster + Bail Top Master Cylinder & Straight Bracket Kit
1955-1957 Chevrolet front power disc brake conversion chrome power booster 7"
Leed Brakes PBKT1084 Power Booster Kit 9" Booster 1" Flat Top Combo Valve Chrome
1965-1968 Chevrolet fullsize Impala power front disc brake conversion chrome ss