I got the 12" drilled/slotted from ebay seller Gripforce. I've also got the F-body calipers. Stops amazing.



And there is no drilling required for the F-Body brakes. You use the F-body calipers and caliper brackets. The bolts that attach the F-body brackets to the F-body hubs are smaller than the GP, so you just use a small bushing in the GP hub, makes the F-body bolts fit perfectly. Some people get the F-body brackets drilled/tapped to fit the GP bolts, but I think the bushing method was much quicker.