Notes: 28550 O-RING 4487 2-249 123.42x3.53 is original CARRARO product. 28550 O-RING 4487 2-249 123.42x3.535 is commonly used in transmissions/axles/engines 133337, 133954, 133955, 134055, 134056, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849