wilwood rear brake help!?

ok guys so i went ahead and bought the wilwood rear brake conversion and im going through some hard stuff to get them on, at first the caliper was no where near going on the (picture) i took the spacer out got the caliper to go over the rotor but its still not far enough over its pushing in on the rotor and i and get the rotor to sit flush! its like i need to shave the caliper to sit farther out? anyone run into these problems? sorry the pics arnt the best