Serpentine Drive Fan Belt is a direct fit for the following:

2008-2010 Ford F-250 Super Duty
2008-2010 Ford F-350 Super Duty
2008-2010 Ford F-450 Super Duty
2008-2010 Ford F-550 Super Duty
6.4L Turbo Diesel Models Only

Genuine Ford Part Number: 9C3Z-8620-B