Front disc brake problem

[Keith6987]

I have a 72 Blazer front Dana 44. I can’t mount the calipers because the pads seem too thick. I bought rebuilt calipers that look just like the old ones. The piston is retracted as far as possible. Rotors have no wear that I can see.

Are there different widths of calipers or rotors that I may have mixed up? The pads are the same thickness as the old ones ,but are at least 3/32” too thick per pad. I didn’t take it apart, so I don’t know if it ever fit.