You can't go wrong with the correct length Goodyear Gatorback, they're about the best brand out there. Just make sure the parts man knows you have the standard Ford alt. and not a Leece-Neville.
It's worth the trouble in my opinion. I've got the slapping, vibrating pre-93 V-belts that are known for premature wear. Years ago one of the sharp partsmen in a major parts house myself and our truck shop dealt with gave me a short "clinic" on why the Goodyear belts were better than the others. Been using them ever since and get right at 50,000 miles out of a set every time, not so with the previous brands. I don't know why they're so hard to find, last set I ordered were from 1200 miles away, couldn't even find any in Billings, MT, plenty of tires but no belts.Thats my first choice when I can get it :thumbsup: