11.75” disc brake upgrade

Doing a brake upgrade on a 70 Challenger project car. Ended up buying a pair of slider brackets and bolts on ebay. I used a ‘78 Cordoba as the “source” vehicle for calipers, rotors, bearings, etc. I re-read the disco-tech article to be sure I had all the parts. Then I noticed he said DO NOT use late B-body calipers. Ooops! What vehicle used single piston KH slider calipers with the hose attachment the same ad E-body ?
Author: Fireman Dan