'55-'64 Chevy Boosters are available in 7" or 8" diameter. For use with ALL41060-41062 master cylinders. The 7" booster is 3-3/4" deep, the 8" booster is 5-1/2" deep.
Product Note: MASTER CYLINDER MOUNTING STUDS 3-3/8" ON CENTER. FIREWALL SIDE MOUNTING PATTERN IS 3-3/8" X 3-3/8" SQUARE. SINGLE DIAPHRAGM BOOSTER. ROD LENGTH IS 4". UP TO 1-1/2 (ACTUATOR) PEDAL TRAVEL.