I have 4 NEW Wilwood D52 Calipers in red for sale . The front part numbers are 120-10936-RD . These fit the stock heavy duty 1.25'' thick front rotors . The rear part numbers are 120-10938-RD . These fit the rear rotor's with 1.25'' thickness . Check out the vendor Capt Fab if you want the perfect brackets to mount these to your 10 or 12 bolt rear end . His kit uses the front rotors from a AWD astro van which are 5'' on 5'' bolt pattern and 1.25'' thick . I'm sure I missed some things as this is my first time to ever sell anything on here so feel free to ask questions . The only reason i'm selling these is I decided the black ones would look better on my truck . I will ship these to your door for $500 as long as you live in the US . Thank You