Madddog, If your rotors are chevy bolt pattern there is a possibility that the wrong bearing races are in them. If who ever first put the car together whent to the junk yard or parts store and bought chevy rotors and didn't change the races to the mustang II races the rotors won't go on the spindle as far as it should. The GM rotors are one inch thick and the granada are 7/8 so the GM calipers are more suited to the Gm rotors as apposed to using the Ford rotors with GM calipers . The piston in the caliper has to make up for the thinner Ford rotor.