Notes: 219-8799/GETG39251 O-RING 3162 2-130 40.95X2 is original CATERPILLAR product. 219-8799/GETG39251 O-RING 3162 2-130 40.95X21 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849