I am putting a rear end out of a 65 Chevy 1/2 ton in my 1949 Chevy 1/2 ton. My only question is what size u-bolt do I use. I know it's a 3" tube, and I can figure the length, I just need to know the actual bolt diameter (ie: 1/2", 9/16", 5/8", etc). I do not need a kit. I already have the perches and shock mounts. Any suggestions on where to buy is appreciated too.