rebuilding front disc calipers

67-72 front disc brakes- 4 piston calipers, Kelsey Hayes, SBP

73-76 front disc brakes- Single piston caliper, slider style, BBP

I have a set of Pin Style calipers that the former owner said came from a 73 Dart but I am unsure if they were stock to the Dart or not as I have not seen any other A-Bodies with Pin Style calipers.

Joe