for everybody that is using offset shackles

DrDiff's rear offset hangars are thicker than the MP. He sells DOM with new ends, 8 3/4" housings with axles and perches any way you want them for about $900.

rusty nailed it on this, depends on whose kit you use. I did this on my 68 fastback, had to elongate ( open up for you chevy guys) the existing hole in the frame rail, for the thing to move a full 3/4", and it did. see the posts back in time on this site, I explained a way to move the spring perches on the axle, no guess work, no measureing, very easy.