The booster mounts with a 4-bolt pattern. The 4 bolts are in a square 3 3/8" apart (center to center). Zinc plated Mounting Brackets rod and clevis designed for a 1955 1956 1957 1958 chevy. Designed for a 1955 1956 1957 1958 Chevy Car.THIS SETUP IS DESIGNED FOR DISC/DRUM APPLICATIONS.
