Found out I didn't need to take the backing plates off, just knocked the studs out, drilled out 3 holes to 1/2" and replaced them with 1/2 x 1-1/2" Gr 8 bolts and lock nuts. Got 2 shocks (get the other 2 tomorrow) and had to scrap the orig. frame bracket and make a longer one that stands straight up. Waiting on the paint to dry and then have to make the tube spacers to position the shock as close to the frame as possible for tire clearance. Once I get the first one done, the other 3 will go a lot faster I hope.