Notes: 129978-42140 O-RING, CW-TCW-P is original YANMAR product. 129978-42140 O-RING, CW-TCW-P4 is commonly used in transmissions/axles/engines 4TNV94CHT-NTBC, 4TNV94HT-ZSKTC, 4TNV94HT-ZSKTC, 4TNV94CHT-NTBC, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849