Do you have the other end of the bolt out? e.g. both halves? Obviously that will have to be removed anyway....

If you do, measure the length needed, then take the stud to your local HW store to match. Chances are pretty dern good the thread pitch will be 1.25. I can't remember, but if teh head is 14mm, that's an M10 bolt.
A local fastener store can find or (if needed) order one that is close enough to work. I don't think that being too long matters here...?

With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
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'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah