Can't find the right bolt Options

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I'm pretty annoyed that not one place around where I live has the bolt I need for the rear st205 tranny bracket (the one that goes through the mount and screws into the bracket). I've been to autozone, advance, and a few hardware stores and can't find anything. I ended up buying a standard bolt that threads in but it's kind of sloppy and I'm worried that it's going to strip the threads out of the bracket over time Anyone with this setup know what size bolt I need and know where I can get it or order it? Maybe what I have in there currently is ok if I just put some lock tight on the bolt.