Yukon YPDBC-01 11" Disc Brake Conversion Kit Rear for Ford 9"/8.8" Yukon disc brake conversion kit ford 9" and 8.8" differentials Kit includes rotors (Inner bore on rotor is 2.800), calipers, mounting brackets and attaching hardware Rotors 5-hole, 4.5" diameter passenger car bolt pattern Caliper mounting brackets fit the 8.8" Truck/9" Late Ford axle housings with 2" X 3.56" (3/8" studs) 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). Hoses, tubes, parking brake cables, and wheels are not included