Notes: 28487 O-RING 45.7X2.62 3181 FKM is original CARRARO product. 28487 O-RING 45.7X2.62 3181 FKM4 is commonly used in transmissions/axles/engines 148605, 150135, 150135, 148605, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849