Bolt Needed - S.O.S.

What size is the threaded portion? Looks like 1/2-20...
If so, get a 1/2-20 x 5" grade 8 bolt, slide a nice thick washer on it followed by a 1/2" ID x 5/8" OD (looks like, take your own measurements) x 2.75 long steel bushing. If you really need the pilot on the end, just carefully grind it in on your bench grinder. Hardware store parts, take about 5 minutes to make.
Adjust the above measurements if I'm mistaken about the thread size.