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Automatic Belt Tensioner Main Drive fits for: GMC Sierra 1500 4.8L 1999-2008 GMC Sierra 1500 5.3L 1999-2008 GMC Sierra 1500 6.0L 1999-2008 GMC Sierra 1500 6.2L 2007-2008 GMC Sierra 2500 5.3L 1999-2000 GMC Sierra 2500 6.0L 1999-2008 GMC Sierra 3500 6.0L 2001-2008 OEM: 12554027, 12580162 (GM)