I reproduce the late '70s B-body 11.75" caliper brackets AND early/late style slider calipers. These bolt to A/B/E/F/M/J/R body disc knuckles.

I also make a brake kit which mates first generation Viper calipers and 11.75" C-BODY rotors to '73-'75 A-body drum knuckles as well as all B/E body drum knuckles.