Yep, I know the C-clamp trick. I need a roughly 2-3/4” long bolt. Corvettes actually used something pretty similar – 2-7/8” long with a 1/2” x 3/8” smooth head. If I can’t find something locally that’s probably what I’ll order. There are also several universal 5/16” ones that must be cut to fit as they are very long, but they are also listed as only Grade 2.

The wedges I bought have a 9/16” center hole, which is an odd size. I’ll probably use a 9/16” nylon bushing with the center drilled out for a 1/2” steel spacer to raise the center pin. That should locate the wedges until I can get the u-bolts cinched down.

Thanks