Restore stable fuel distribution, rail pressure integrity, and dependable common rail performance on your 2004.5-2005 GM 6.6L Duramax LLY with this genuine Bosch fuel rail. This direct-replacement fuel rail helps address service concerns such as fuel leaks, contamination, damaged fittings, rail pressure instability, and other common rail fuel system performance issues. Bosch: F00R001512 Installation Note: Inspect related fuel lines, fittings, seals, and rail connections during installation. Fitment Note: Verify build date, VIN, engine application, emissions package, and existing part number before ordering.