Authentic GM Fuel Injector used in 4.3L and 5.7L pre 2007. GM Part Number 12567905. Injector contains one black and one blue o-ring. Newer models use (GM 12609192). If you have a newer model see part number 446155.
Authentic GM Fuel Injector used in 4.3L and 5.7L post 2007. GM Part Number 12609192. Injector contains one red and one blue o-ring. Older models use (GM 12567905 with black and blue O-rings). If you have an older model see part number 446105.