Notes: 71066.5 O-RING 3550 2-161 139.37x2.62 - is original DOOSAN product. 71066.5 O-RING 3550 2-161 139.37x2.62 -1 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849