Fits: 2003-2007 Ford F-250/350/450/550 6.0L Powerstroke (Single Alternator) 2003-2005 Ford Excursion 6.0L Powerstroke (Single Alternator) 2004-2010 Ford E-350/450 6.0L (Single Alternator)This Dayco 89313 Automatic Belt Tensioner-Main Drive is engineered and built to outlast all other aftermarket bel...