Here is the part number that Troyer has listed.
"This kit requires a 1 inch shorter serpentine belt, and we recommend the Goodyear Gatorback serpentine belt as it's much higher quality, and are no more expensive than the factory belt. This will also stop the serpentine belt "squeal" that is heard many times during heavy-throttle upshifts in these vehicles, especially if a performance tune is being used. We carry these Goodyear Gatorback belts, for 2002 & 2003 F-150's, order our Part# 4060980, and for 2004 & up F-150's with the new 3-valve 5.4 engine, order Part# 4061010. All of these belts are listed at the bottom of this page, as well as in the "Belts" section of our Store here. For 2003 F-250 SuperDuty Trucks, the correct belt to order is our Part# 406990. "
It is their part number but they have it listed as 1" shorter. I am sure the guys at the parts counters could pull that out.
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