I have a 59 GMC bigbolt that has the wide belt. Just got a new belt at NAPA. I don't know about pickups.
So possibly look for a GMC generator or pulley.
(oops, sorry, mine is 12v) but maybe you could use the pulley.

Last edited by Old GMC Gold; 10/16/2014 7:25 PM.
57 GMC LCF 370
55 John Deere 40-W
59 John Deere 430-W
2000 GMC 4x4
56 John Deere 420-W
Pix on Photobucket