stuart, no disrespect but gary is EXACTLY right about discarding the old u-bolts. for one thing the torque to properly seat the bolts will stetch the bolts. after 50 or so years of being on the truck, it makes sense they are not what they once were. besides, they cost about 4 bucks each.
now maybe stuart hasn't had any problems, but dave(me) hasn't won the lottery so i figure i ain't that lucky. if i tried to do that the bolt would bust, and take the centerbolt with it, and the whole mess, me included, would end up in the ditch.