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 C4500 Kodiak: 2003] - [Chevrolet C5500 Kodiak: 2003] - [Chevrolet Silverado 2500 HD: 2001, 2002, 2003, 2004] - [Chevrolet Silverado 3500: 2001, 2002, 2003, 2004] - [GMC C4500 Topkick: 2003] - [GMC C5500 Topkick: 2003] - [GMC Sierra 2500 HD: 2001, 2002, 2003, 2004] - [GMC Sierra 3500: 2001, 2002, 2003, 2004]