A Body Disc Brake Swap 101
In addition to getting the correct caliper brackets for the size rotor you want to run, you also want to make sure you have the correct bracket for the type of caliper (either slider or pin type) you'll be using. Good reason for the first timer to get the complete assemblies (upright, rotor, caliper bracket, caliper assemblies, etc.) from a donor car, then replace the worn out stuff with new that matches the old.