Offset spring kits???

For 3/4" of offset, you'd have to cut a hole big enough for the whole hanger to slide into the frame 1/4". At that point the frame structure would be seriously compromised.

When I re-drilled, I welded up the old holes and cut the overlapped section of frame rail spot welded to the piece the hanger bolts to, so the hanger butts the frame with no interference. Then I just welded that joint to maintain the structure. I'm really surprised no one has done this?!