This is a genuine GM Reductant Fluid Injector with the part number 55515114, suitable for Chevrolet, GMC, and Cadillac models with a 3.0L diesel engine. The item is a direct replacement for the OEM part and has 100% accuracy of fit. Please note that only part reference #10 on the diagram is included in the package. As a Bonus we are including the one time use clamp that hold the DEF injector in place. Please check the part number listed for the correct fitment to your application. This is an electrical part and no returns are accepted. GM retail for the DEF injector is $251.78, the bonus clamp has a retail of $10.58.