Notes: 28500 O-RING 2075 018 18.77X1.7 is original CARRARO product. 28500 O-RING 2075 018 18.77X1.75 is commonly used in transmissions/axles/engines 128420, 138620, 139003, 139005, 139006, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849