Notes: 2100934 O-RING 2037 9.25x1.78 VITON 75 SHORE A is original CATERPILLAR product. 2100934 O-RING 2037 9.25x1.78 VITON 75 SHORE A1 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849