Notes: 28551 O-RING 4550 2-254 139.29x3.53 is original CARRARO product. 28551 O-RING 4550 2-254 139.29x3.535 is commonly used in transmissions/axles/engines 135100, 136065, 141952, 141952, 141952, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849