Duramax: LB7, LLY, LBZ, LMM, LML (2001-2016)Features: OEM design with washers. Thread length increased to accommodate washer thickness. Two screws are 5 mm longer to accommodate the downpipe mounting bracket. Our design preserves thread engagement whereas other companies do not.All 12 screws will be alloy steel 12-point screws in black oxide finish, class 12.9. (10) M10 x 1.5 x 32 bolt and washer(12) M10 washers(2) M10 x 1.5 x 37 bolt and washerFeatures:OEM design with washers.Thread length increased to accommodate washer thickness.Two screws are 5 mm longer to accommodate downpipe mounting bracket.Our design preserves thread engagement whereas other companies do not.Compatible Vehicles2016 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2016 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2016 GMC Savana 8 Cyl 6.6 Liter Turbo2016 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2016 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2015 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2015 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2015 GMC Savana 8 Cyl 6.6 Liter Turbo2015 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2015 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2014 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2014 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2014 GMC Savana 8 Cyl 6.6 Liter Turbo2014 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2014 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2013 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2013 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2013 GMC Savana 8 Cyl 6.6 Liter Turbo2013 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2013 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2012 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2012 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2012 GMC Savana 8 Cyl 6.6 Liter Turbo2012 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2012 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2011 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2011 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2011 GMC Savana 8 Cyl 6.6 Liter Turbo2011 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2011 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2010 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2010 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2010 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2010 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2009 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2009 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2009 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2009 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2008 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2008 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2008 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2008 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2007 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2007 GMC Sierra 3500 Classic 8 Cyl 6.6 Liter Turbo2007 GMC Sierra 2500HD Classic 8 Cyl 6.6 Liter Turbo2007 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2007 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2007 Chevrolet Silverado 3500 Classic 8 Cyl 6.6 Liter Turbo2007 Chevrolet Silverado 2500HD Classic 8 Cyl 6.6 Liter Turbo2007 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2006 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2006 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2006 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2006 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2005 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2005 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2005 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2005 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2004 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2004 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2004 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2004 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2003 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2003 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2003 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2003 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2002 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2002 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2002 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2002 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo2001 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo2001 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo2001 Chevrolet Silverado 3500HD 8 Cyl 6.6 Liter Turbo2001 Chevrolet Silverado 2500HD 8 Cyl 6.6 Liter Turbo