1973 Duster Disc Caliper Bracket

73+ A-body calipers were all the slider caliper type. E-bodies used pin type calipers, so while the rotors were the same 73+ the calipers and brackets were different. B-bodies mostly got slider type calipers, but, it depends on the year and model. Some years/models had pin type calipers.

The slider caliper brackets are the only ones being reproduced last I checked, pin type caliper brackets you have to find used. As far as what will fit, the slider type brackets will fit any car using the 73+ style spindles and the rotor size that goes with the bracket (10.87 or 11.75), for any A/B/E/F/M/J/R. body. You just have to use the corresponding slider caliper.

As for what's correct or original, E-bodies and some years/model of B bodies (and FMJ and R bodies) would have pin type calipers.