Using mustang rotors for 4.5" bc
Next a spent about an hour on each caliper with a small disk sander and a 80 grit disk cleaning up the calipers. Removed lots of rust and scale off the calipers and got them looking pretty nice.
Then a coat of rustoleum rusty metal primer, and 2 coats of high temp semi-flat black paint I had the calipers looking pretty nice. (as far as interals, I rebuilt these calipers about a year ago).