Brand New Set Diesel Glow Plugs Allows Replacement of Failed Glow Plugs Set Includes:8 Diesel Glow Plugs Compatible With 2006-2016 Chevrolet Express 2500 (6.6L V8 Turbo DIESEL) Compatible With 2006-2016 Chevrolet Express 3500 (6.6L V8 Turbo DIESEL) Compatible With 2009-2016 Chevrolet Express 4500 (6.6L V8 Turbo DIESEL) Compatible With 2006-2016 Chevrolet Silverado 2500 HD (6.6L V8 Turbo DIESEL) Compatible With 2007-2007 Chevrolet Silverado 2500 HD Classic (6.6L V8 Turbo DIESEL) Compatible With 2006-2006 Chevrolet Silverado 3500 (6.6L V8 Turbo DIESEL) Compatible With 2007-2007 Chevrolet Silverado 3500 Classic (6.6L V8 Turbo DIESEL) Compatible With 2007-2016 Chevrolet Silverado 3500 HD (6.6L V8 Turbo DIESEL) Compatible With 2006-2016 GMC Savana 2500 (6.6L V8 Turbo DIESEL) Compatible With 2006-2016 GMC Savana 3500 (6.6L V8 Turbo DIESEL) Compatible With 2009-2016 GMC Savana 4500 (6.6L V8 Turbo DIESEL) Compatible With 2006-2016 GMC Sierra 2500 HD (6.6L V8 Turbo DIESEL) Compatible With 2007-2007 GMC Sierra 2500 HD Classic (6.6L V8 Turbo DIESEL) Compatible With 2006-2006 GMC Sierra 3500 (6.6L V8 Turbo DIESEL) Compatible With 2007-2007 GMC Sierra 3500 Classic (6.6L V8 Turbo DIESEL) Compatible With 2007-2016 GMC Sierra 3500 HD (6.6L V8 Turbo DIESEL) See Compatibility Chart To Verify Your Specific Vehicle Year, Make, & Model Replaces 12639701, ACDelco 9G, GP114 Replaces GM 12639701, ACDelco 9G, GP114