I got my KH brake parts from here:
http://www.dallasmustang.com/root-catalog/brakes/brake-calipers-components.html
You may have to look for the caliper bolt on their site. I just needed clips when I did my brakes. Another source Ive used is
http://www.tonysparts.com/
Just call and tell them what you need. They are really good and reasonable on pricing