One of the guys in the club is parting out a 78, give me a call and I'll give you the contact info. I'd bet that he'll bring it to the Roundup that you're coming to (hint, hint) in April down at Katemcy. ;D
PS - I've got those u-bolts in my truck if you still need to use them.
It's starting to come along, good work. I'll advise you, like everyone else, to stretch that wheelbase now, to 100" or more, before you assemble it. Do it once, and save yourself another winter teardown. 92" sucks a fat one on a steep waterfall.