Newly Purchased 82FC33 with No Dash Air Belt...Pulley Conversion for Alternator

[Joe]

I am the proud new owner of a near mint 82FC33. Like a lot of FC's my
AC belt is off due to belt throw problems as is so common. I have
heard about using a 7/8" bore, 3 groove pulley (possible a Mack part??)
on the alternator and running the AC for the dash off of it. I am
really having a hard time coming up with a part number. Any help would
greatly be appreciate.

TIA,
Joe