Notes: 28683 O-RING 4143 2-221 36.1X3. is original CARRARO product. 28683 O-RING 4143 2-221 36.1X3.5 is commonly used in transmissions/axles/engines 643805, 643807, 644154, 644154, 643807, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849