Notes: 210-5931/GETX02956 FIFTH WHEEL 38.1X45X2.4 is original CATERPILLAR product. 210-5931/GETX02956 FIFTH WHEEL 38.1X45X2.41 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849