I put one on a couple of months ago and was also missing parts. Bought it from JCWhitney and called Hellwig...they had all of the missing parts to me within a few days....they forgot to tape the box shut but luckily they didn't fall out. I'd try calling them back again, a lot of people here have had parts shipped right to them when they are missing or break.
As for the nuts on the U-bolts, take the outer ones off and put some loctite on them, works wonders
