Good used set of Nascar AP Billet Aluminum narrow body 4 piston front race calipers w/ differential bore 

1.87" (48mm) x 1.75" (44mm) Billet Aluminum pistons for PFC pad shape 7767, AP CP2279 D50 ect. 

Recommended  rotor diameter is 12.0"- 12.8' x 1.00"-1.25" rotor thickness. Ap part # CP5835-4 & 5 SO.

Pistons have been machined to use a slightly thicker pad w/ pull back clips but can still be used w/ the

standard thickness pad as well.