This fuel injection return line gasket kit is designed to match the original components required to repair the fuel line and restore proper pressure on specified vehicles. It's made of quality components for reliable performance. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Chevrolet Silverado 2500 HD: 2001, 2002, 2003, 2004] - [Chevrolet Silverado 3500: 2001, 2002, 2003, 2004] - [GMC Sierra 2500 HD: 2001, 2002, 2003, 2004] - [GMC Sierra 3500: 2001, 2002, 2003, 2004]