A properly functioning glow plug is essential to cold-weather starts. This direct replacement for the original part restores proper glow plug function and has been validated for specific vehicle years, make and models. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Chevrolet T7500: 2004, 2005, 2006, 2007, 2008, 2009] - [Chevrolet T8500: 2004, 2005, 2006, 2007, 2008, 2009] - [Chevrolet W3500 Tiltmaster: 2007, 2008, 2009, 2010] - [Chevrolet W4500 Tiltmaster: 2008, 2009, 2010] - [Chevrolet W5500 Tiltmaster: 2008, 2009, 2010] - [Chevrolet W5500HD Tiltmaster: 2008, 2009] - [GMC T7500: 2004, 2005, 2006, 2007, 2008, 2009] - [GMC T8500: 2004, 2005, 2006, 2007, 2008, 2009] - [GMC W3500 Forward: 2007, 2008, 2009, 2010] - [GMC W4500 Forward: 2008, 2009, 2010] - [GMC W5500 Forward: 2008, 2009, 2010] - [GMC W5500HD Forward: 2008, 2009] - [Isuzu FTR: 2004, 2005, 2006, 2007, 2008, 2009] - [Isuzu FVR: 2004, 2005, 2006, 2007, 2008, 2009] - [Isuzu FXR: 2004, 2005, 2006, 2007, 2008, 2009] - [Isuzu NPR: 2007, 2008, 2009, 2010] - [Isuzu NPR-HD: 2008, 2009, 2010] - [Isuzu NQR: 2008, 2009, 2010] - [Isuzu NRR: 2008, 2009, 2010]