Notes: 1990807 - p/o 20266 RUNG D14.5X34.5 BLOC.DIF is original CATERPILLAR product. 1990807 - p/o 20266 RUNG D14.5X34.5 BLOC.DIF1 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849