Replaces OEM #315GC445G. IMPORTANT: Please call toll-free 1-800-282-9319 to order. Please have the following information available when ordering: Truck Model, Last 6 Digits of Truck Serial Number, and Engine Assembly Number. The Engine Assembly Number will be located on the engine tag on the front valve cover of the engine and will start with 11GBA. ASSEMBLY,Oil Pump (High Pressure) Includes Gears (1)EGE-2590 (1)EGE-8910 (1)EGE-8920 Housing Assembly (1)EPB-3352 Covers (1)EPC-3353 (10EPR-3357 Plunger (1)EPL-2061 Spring (1)ESP-3354 Gasket (1)EGK-3349 (1)EGS-3900-018 Screws (4)ESC-0007 (2)ESC-0854 Nuts (1)BNU-0195 (1)ENU-3348 Lock (1)EPR-3356 Key (1)EKY-2644 O-Ring (1)EGA-2997.