HH56,
I am not really well versed on other Packards. This was my father's and he grew up with these cars, and was what I consider an expert. Unfortunately for me, I am not. I am still learning how to work on this one. I read a lot of books and websites to pick up as much info as I can. In my online research and with the belts that I had to work with. I discovered Napa has a belt that they offer.
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Belt-Accessory-Drive/_/R-NBG2524438_0201601186 I had one of the Napa belts and it was a bit smaller so I used another spare that was left to me. It is exactly .75" wide at the top and (guessing here) about .5" at the bottom. It does not have cogs like the Napa one does.
It fit the pulley like a glove. When I ordered the alternator, I followed up with a phone call to confirm that they put the .75" pulley on the unit. It came installed and was fine out of the box.
I hope this is helpful...
Rich
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