Notes: 129C21-75010 ECU ASSY,4TNV88C-PTB is original YANMAR product. 129C21-75010 ECU ASSY,4TNV88C-PTB2 is commonly used in transmissions/axles/engines 4TNV88C-PTB1, 4TNV88C-PTB, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849