These Laser cut 3/8 brackets brackets marry two of the latest GM offerings together to form an awesome bang for the buck performance brake upgrade. We created this bracket to use the Base JL9 calipers or the Cadillac ATS calipers on on a 13.6 Z51 rotor, normally these calipers are used on a 12.6 rotor. Many ATS and JL9 calipers are quickly replaced by owners of ATS and C7 base corvettes in favor of the XTS or Z51 sized brakes, these left over`s usually are very well priced and can be put to use to form a budget friendly medium sized brake set up with ease and on budget. This conversion needs no rotor modification like some brembo conversions and also requires no caliper milling like our regular Z51/XTS conversion do. Due to using the smaller rotor based JL9 and ATS calipers on a larger rotor, the calipers anulas does come very close to the rotors OD at the exit and entrance points of the rotor of the caliper and minor reliefs may be needed but unlikely.