Thank you to all that answered my plea!

Result - The consensus was first, it should have come with the nut,
but since it didn't, I should take it to a fastener specialty place.  So
I did.  First place had the right size, but not the right threading.
They pointed me to another shop that specialized in metric
fasteners.  Second shop had the right size - 14mm x 1.5.  The 1.5
threading was the piece of the puzzle so hard to find at normal
places.  The threads on the alternator itself were also a little
messed up about half way down, but they assisted with how to
address that problem.

Thanks again for all the help!
Tonya
87 GL Wolfs