Wilwood’s Open Wheel Bracket kits are manufactured from high strength aluminum alloy with an e-coat finish. Bracket set 250-13179 is designed for Midget Inboard rears with a 5.25” side bell mounts. Bracket mounts the BNDLR caliper with a 4.75” center to center and using a 10.50” diameter rotor. (Don’t use 1.88 pistons BNDLR)