I have been sitting on two sets of rotors for ages and it's time to figure out what the heck I'm doing with them. From what I know, all Girling, vented, front brakes from 240s use the same rotors--from early to the end. The height of the "hat", that is from the surface of the disc to the outside of the car, is about 1 13/16" depending on how much they've been turned. I have two sets of brand new rotors that, for some reason, only measure about 1 5/8 for the hat height. They have the right bolt circle and the proper retainer bolt holes, so I know they are for Volvo hubs. Once mounted, you cannot get the caliper over them and still get teh caliper to fit its mounting pads. Could these be from ATE front brakes? I probably bought them on E-bay so they may have come out of Canada. Are the ATE front calipers used on Canadian market cars?

Any clues will be appreciated.

Dave