So im currently working on getting my '96 gsx brakes in order. The current situation is that it has a StopTech BBK from like a decade ago. Its got old calipers that still work fine from what I can tell, but the slotted rotors are heat cracked and need to be replaced. The problem is that I cant...

I have installed Evo 8/9 on my rear brakes and noticed the caliper seats far away from the rotor. This means the pistons will have to extend by 1/2 inch before making contact with the rotor.Is this normal or my after market rotor are thinner than stock? I thought the rear caliper were bolt-on...