HELP Alternator Bolt is GONE!

[SirNik84]

I was looking under my car (84 300SD) and the bottom alternator bolt is gone.
the alternator is not moving, the top bolt is holding it in place, the alternator is pushed up agenst the blcok. all i can think is the guy who changed the alternator for me a while back must have done this, because everythign is tight.

when i changed the alternator years ago i remember that the botom bolt threaded into the bracket... and NAPA dosen't know what size bolt that is. So, can anyone tell me the diameter, lenght and thread pitch of the bottom alternator bolt?

Thanks

Nik