Kelsey Hayes on 71 demon?
Stock, My 71 slant 6 swinger had them [no sway bar].
They work fine with my in my 340 valiant.
Need to be in good condition though or they will suck air, and get a quality master cyl for like a 68 gts cause I swear every time I've bought one for the 71 swinger it never actuated the front discs right and it wasn't until I got one from napa for the 68 gts that they finally worked like new.
It has the 2 round pop outs on the cap.
Auto specialties is where I bought the last set of calipers $68.00 ea.