You looking to replace all 6 bushings in your front suspension (3 per side)? You know that there are 2 different sizes, right? I replaced my bushings and failed to realize this, I figured they would all be the same. I got the dimensions from Brute4c and just went to my local auto spring shop, they had them in stock. I'm not sure if NOS rubber stays good after 30-40 years. Good springs shops should also be able to make you new u-bolts while you wait.