Notes: 209-9883/GEUG58760 BEAM SI 26.24 (370650) L1 is original CATERPILLAR product. 209-9883/GEUG58760 BEAM SI 26.24 (370650) L11 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849