Plymouth duster rear suspension questions

I think Mancini’s stuff is just the MP stuff. The DoctorDiff kit is nicer, the MP front hanger requires clearancing the frame rail for the gigantic nut they weld into their hanger. And it’s not a matched set. The MP kit is advertised as a 3/4” offset (vs the 1/2” DD kit), but it’s a 1/2” offset front hanger and 3/4” offset rear shackles. They tell you to put the spring perches 3/4” in, but all that does is side load the spring and force the front eye bushing to load at an angle since the hanger only moves a 1/2”.