Our 72 Hornet's got the KH disk brakes. Had a leaky caliper, so I got new calipers, hoses, shoes, etc. (The leak turned out to be a loose hose! but the calipers looked end-of-life so I changed them and the hoses anyways).
Everything was available, and inexpensive -- I even had a choice of organic vs. metallic pads -- except the rotors, which are special order and either $111 or $200 -- EACH!! Yow! Luckily these are just fine, and still 1/4" of pad, smooth, no grooves, etc.