I said drill one hole per side for the shackle mount bracket. Only one new hole is needed per side because if you flip the bracket (or swap sides - I can't remember) one of the factory holes is still usable. This works with all A bodies. Think about it - if you move the bracket over 1/2"-3/4", whatever you want to call it, offset shackles or not needed. I will try to remember to take a picture when I get home today. Again - Dr. Diff recommended this trick. No pricey offset kit necessary!
