ok just got off the phone w\speedway motors....there mustang II uses the Moog K772 both upper and lower...my Afco upper arms use a K772 and they definitley dont fit the bottom as they are to small....they couldnt find me any more info....i explained using the chrysler ball joint worked and they said to just drill a hole down the shaft where i need it for the cotter pin and that would be perfectly ok...so i think i amy do that unless someone can shed some light on an exact fit ball joint for belltech drop spindles
I would just run the K778 and get a thick washer. There isn't any harm on adding a washer to make the cotter pin line up. Thats about the best I can tell you, I haven't played with these as a lower ball joint, just the uppers.