Easily installs 11″ rotors and ’78-up GM “Metric” calipers to your ’37-’48 Ford passenger car spindles or ’37-’47 Ford pickup spindles for increased stopping power, No machine work needed on round back spindle. Minimal modification on square back spindles, Includes new rotors and semi-metallic pads, new bearings and seals, new caliper bolts and calipers, along with caliper mounting brackets, bushings, hardware, and hoses, GM 5 x 4-3/4 inch bolt pattern rotor with 2.78-inch hub OD, Works with bolt-on steering arms or stock arms.