All the research I did on this indicated it was a bolt on swap, except for some minor issues on the rear, and there is my issue. Everything I read indicated that the GT caliper (mine is a 98 model) will work fine with the Cobra rotor as long as you use the Cobra caliper bracket to place the caliper in the correct position relative to the rotor. Still no prob cause I bought the FRPP M-2300-M rear brake kit to do this. My worn GT brake pads are actually 1/32 thinner than the new stock Cobra brake pad so still no problem right? Well I can't seem to get the caliper piston to collapse enough to make a wide enough opening for the new Cobra rotor which as you know is wider than the stock GT rotor, to fit. I have the caliper off the car, I have removed the bleeder, drained the fluid, and am using a C-clamp to apply pressure to collapse it. It will collapse until it compresses against the emergency brake internals and then stops which does not give me the room I need for the rotor. SO, is this 98 GT caliper really supposed to work somehow, or when people say the GT caliper works, they mean 99 and up? Is there a differance between the 98 and 99 GT rear caliper? What do you Brake experts know about this?