...BTW your Bieber avatar is awesome.-Malone
Is it special? I thought it was an M12 hex washer head? Maybe it depends on which alt you have ac or non ac?Post a pic of what you are looking for, I maybe able to help.
Right I have a gas alt on my diesel. IIRC it was an 11mm bolt on the gasser as I had to drill it to fit the diesel to 12mm. Post a pic as it may just be a 12mm that is pretty long, but I should be able to get.