Restore fuel delivery, starting performance, and smooth operation on your 2003-2004 Dodge Ram 5.9L Cummins with this new genuine Bosch Fuel Injector. This direct-fit common rail injector helps maintain OE fuel system function. A worn or failing injector can cause hard starting, rough idle, smoke, fuel knock, misfires, low power, poor fuel economy, and other fuel delivery concerns. Bosch: 0445120255, 0 445 120 255 Cross References: 0986435503, 0 986 435 503, 68004082AA, R8004082AA, R8004082AC, 3947550, 3949619, 4940589, 5263318 Installation Note: New sealing washers, O-rings, and proper injector bore cleaning are recommended. Fitment Note: Verify build date, VIN, engine application, and existing part number before ordering.