2012 Cummins ISX, Truck Tractor, ECMs, Fits to: Peterbilt 587, 2012 Cummins ISX. ECM. S/N-34616 P/N-4993120 HP-450 Engine Model-ISX CPL/AR:3719 PIN-60/60/60 For more information about this item call. We ship worldwide., Serial# 79469011, Casting# 79469011, Truck Year 2012 1XP4D49X9CD123580