Serpentine Belt is a direct fit for the following:

2006-2010 Chevrolet Express 2500
2006-2010 Chevrolet Express 3500
2002-2005, 2011-2015 Chevrolet Silverado 2500 HD
2002-2005 Chevrolet Silverado 3500
2011-2015 Chevrolet Silverado 3500 HD
2006-2010 GMC Savana 2500
2006-2010 GMC Savana 3500
2002-2005, 2011-2014 GMC Sierra 2500 HD
2002-2005 GMC Sierra 3500
2012-2014 GMC Sierra 3500 HD

6.6L Engines

Genuine GM Part Number: 12642433