[71blksuper4x4]

Differences in the length the hangers hang away from the frame to line up the springs. C30 are shorter than k30 but hang off the frame narrower than that of the k10 and k20. I put squarebody k20 hangers on mine, which made it level, but I just have a 3/4 ton rear out of a square body that lines up for mock up. I may change out to K30 hangers yet. 67-72 Hangers hang the same distance away from the frame as c30-k30’s. All of this was trial and error. Honestly, I think you could make the factory Duramax hanger work fine in your application.