I believe the rotor backing plate is the same for both the base brakes and 'bono's. When people have switched from base to the 'bono's. They didn't have to change the backing plate far as I know. The Stillen kit backing plates are thicker then the oem plates. This is to resist flex in the plate. It also is a little farther away from the rotor. This is so that when it flexes, it doesn't hit the rotor. I ran the Stillen kit for years. Then I increase my hose size to 3". That was a PITA to install.
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