This rear disc brake kit may be low buck, but it really works! Kit includes 11'' rotors, calipers, mounting brackets and attaching hardware. The rotors have the popular 5-hole, 4.5'' diameter passenger car bolt pattern. Caliper mounting brackets fit the popular 8.8'' Truck/9'' Late Ford axle housings with 2'' x 3.56'' pattern and big 3.15'' diameter bearing. This kit is designed for vehicle installations with a 2.5'' brake gap (housing flange-to-axle shaft flange).