72 scamp rotor fittment issue

I have a 72 scamp that I decided to put front brake rotors on. The car has kelsey hayes 4 piston calipers and the rotors are the ones you press the studs out to seperate the rotors. I bought some aftermarket type rotors for it. Here is the issue. I installed the rotors with no issues. The rotors are identical in size depth ect. I bolted the calipers on and now I can put the back pad in but the front side pad lacks about an 1/8th of an inch from being able to fit it in between caliper piston and rotor. Thought maybe I would turn rotors to make them a little thinner. I did turn them and still cant install pads. What gives??? the hubs are the same with the same bearings. Only difference is rotors. They are just a little thicker. Any advise??