Notes: 121850-51960 O-RING is original YANMAR product. 121850-51960 O-RING5 is commonly used in transmissions/axles/engines 2TNV66-DMC, 2TNV66-DMIN, 2TNV70-APK, 2TNV70-ASG, 2TNV70-ASG, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849