Notes: 213-4222/GETG87031 THRUST SHOE 50.1X61X2.5 is original CATERPILLAR product. 213-4222/GETG87031 THRUST SHOE 50.1X61X2.51 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849