Okay so here's what I learned today. The P5 calipers can be modified to work with your existing GTR rotors using 6mm spacing disks, bolts that fit the caliper and 2 sleeves (ID 12mm OD 14mm) around the bolts in the stock GTR spindle bracket. The P5 rotor won't work on the stock bracket, it's too small and the pads stick out the top of it. If you're feeling money, you can go and get yourself a mazda6 rotor. I lined it up, but I haven't tested it - looks like it will clear the P5 caliper and be much more readily available than another GTR one. Plus the setup will clear your sweet stock enkei rims.
*edit - Forgot to mention, the mazda6 and P5 caliper brackets both use the same bolt pitch. The reason I was screwed up was because the P5 caliper I got had messy threads.
*edit 2 - the bolt pitch in question is a M12 (1.25) and the bolt itself needs to be 40mm long to get decent thread depth in the caliper. You'll also need 12mm lockwashers and I also put anti seize in the spindle bracket so the sleeve won't rust itself in there.
*edit - Forgot to mention, the mazda6 and P5 caliper brackets both use the same bolt pitch. The reason I was screwed up was because the P5 caliper I got had messy threads.
*edit 2 - the bolt pitch in question is a M12 (1.25) and the bolt itself needs to be 40mm long to get decent thread depth in the caliper. You'll also need 12mm lockwashers and I also put anti seize in the spindle bracket so the sleeve won't rust itself in there.
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