Notes: 1990660 O-RING 3200 2-136 50.47x2.62 - is original CATERPILLAR product. 1990660 O-RING 3200 2-136 50.47x2.62 -1 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849