Top Alternator bolt?

[i8yourfwd]

Ok so out of nowhere I got squealing from my engine bay. I checked and it was a little loose, so I said I was going to tighten it a little later. Then later on, I realized that my bolt on the top of the alternator (to adjust the position of it) dissapeared. I was wondering what kind of bolt this is. How long is it, what kind of thread, what diameter, etc. Or where I could just ask for it and pick it up? No I don't want to pay $50 for a bolt and wait 6 months from a dealer.

EDIT:Will the top bolt off a SOHC alternator fit? I've seen a few zenki's at the junkyard, but no chukis.