2000 Mack N/A, Truck Tractor, ECMs, Fits to: Mack Other, (Used) 2000 Mack, ENGINE ECM- Part Number: 21900553, Serial Number: T13244414, 2 Rectangular Plugs with 62 Pins, Reference images for condition. 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# T13244414, Casting# T13244414, Truck Year 2000 1M1AW31Y9EM040084