Cant hurt to shoot them and email and see if they will just send you a new bolt for free or I'm sure for next to nothing.
If not I have a hard time beleiveing that someone at home depot couldnt get you one at least close to that size if not the exact one.
Just attempted to contact nearly every single email on LTD's site; they were all unreachable. Pretty ridiculous. Is the company dead already?
Guess my best bet is Home Depot.