Ran across this when looking for Crown Vic stuff.
 
https://www.ebay.com/itm/168135523102?itmmeta=01KMK9FR9VEC9193H0E3DNKPBS&hash=item2725a87b1e:g:NOoAAeSw61Bpg8P3

Double groove pully would be for and air-conditioned car.  I took mine off my Skyliner.  The front bearing was starting to squeel.  I could not get the pully off without destroying it (single).  Bing how the top takes current, I called Concourse and ordered a 10-si alternator, and just changed the thing over.   I am glad I did, because I also late last year ordered a new electronic ignition SYSTEM (every thing except plugs).   I'd be leary of converting ignition over with a generator.