Notes: 231-0670/GEUG46443 DIFF.PLANET.GEAR PIN L167 D28.55 is original CATERPILLAR product. 231-0670/GEUG46443 DIFF.PLANET.GEAR PIN L167 D28.551 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849