So I got this alternator...

I have an alternator...pretty sure it was from either my Ramcharger or Duster....but its possibly from my buddies 86 C10.
Suggestions on how to verify?

Its got a 2-rib v-belt pulley.
Has a tag that says Ultima 01-0153 and 83277810.
Another tag 43 08 274 51
201 remanuractured 531