I did this to my 69 Camaro and a couple chevelles. I had to use 2 of the same side on the camaro because the shocks mount 1 on each side of the axel housing. IIRC it was 2 pass side setups but dont quote me on that. The flanges on the end of the axel tubes on my 69 are the same as on the GN. I had to drill one bolt hole to make to use all 4 bolts in the backing plate on the LS1 setup and trim the flange a little to make the backing plate fit. The Chevelle needed no relocation. Just the extra hole drilled and flange trimmed. I plan on doin all 4 corners of my GN in the future. The front is a little more involves. Requires modding the spindle a little, machining an old rotor and fabbing a bracket. The bracket can also be purchased from a company called Kore 3. Hope this helps.