Alright, I referenced the calipers and they come back 1981 GM truck. They are part number K18007150 N GM. I took the 13200's back and got the 13100's and same problem, caliper too big for the spindle. Since my truck had 1in rotors to begin I guess the next step is to get the 13200's back and go to a parts store and check out the calipers they have listed for my truck and try them out. This just figures, everytime I go to do something on a old car/truck I run into this kind of oddball crap.