Brake Drum: Rear 67-74 F & A with 1/2 fins (ea)This rear drum is designed in the original style for 1967 74 Camaro and Firebird TA models, featuring half fins for improved cooling. While most rear drums, unlike the fronts, come finned, the cooling advantage may be minimal. These parts are now manufactured in in countries including China, offering an affordable, reliable option for those seeking finned rear drums. The hub hole is 70mm or 2. 78.. make sure this is correct on yours before ordering or