RockAuto for the studs, the caliper rebuild kit, or a loaded caliper:
DORMAN Part # 610130 {AutoGrade - Boxed #2768028}
Front Right; w/Front Disc Brakes
There is always SSBC for the calipers as well, and they sell complete KH kits that use the Mustang KH rotors - makes it easier in the future to replace parts.
Found this Ford rotor on RockAuto, same outside diameter:
RAYBESTOS Part # 6072R {Professional Grade; Outside Diameter 11.04" / 5 Bolt Holes}
Front; 4700 Lb GVW; Power Brakes; 4600 Lb GVW