2012 HUB PILOT NA, Truck Tractor, Hubs, Fits to: Western Star 4900 SA, (Used) 2012 Western Star 4900 SA, COMPLETE FRONT DIFFERENTIAL HUBS- Side: Driver Left Side, Material: Steel, Part Number: 33063A7051G3.91, Serial Number: FOR01693784, Make: Meritor/Rockwell, Model: RP23160NCN1806 391, Ratio: 3.91, Capacity: 23,000 Lbs, Hub Bolts: 10, Brake Type: Drum, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY, ELKTON, MD 21921, Serial# TBD, Casting# TBD, Material Steel 5KJJALDR8CPBN4842