2020 Western Star 4900EX, Truck Tractor, Exterior Misc Parts, Fits to: Western Star 4900EX, (Used) 2020 Western Star 4900EX, DEF TANK COVER- Part Number: 06-78191-201 Side: Driver Side, Material: Aluminum, Include: STEP For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Truck Year 2020, VIN 5KJJABD17LPLS6893, Part# 06-78191-201 5KJJABD17LPLS6893