Wilwood’s Rear Disc / Drum brackets kits (less caliper brackets) are manufactured from either high strength aluminum alloy or proprietary cast iron alloys. Aluminum brackets use steel 5/16-24 clinch nuts for caliper bracket or accessory mounting. Cast iron brackets offer a simplified high strength monolithic assembly with integral mounting pillars and cable stop brackets. Both styles of bracket assemblies are fully populated with drum parking brake shoes, springs and adjusters. Bracket installation will require additional caliper brackets to mount within the ranges of 11.00" integral hat rotors to 14.00” hat mount rotors.