Notes: 1990693 WASHER 50.3X78X3.4 MAT101 CARRARO STD. 1 is original CATERPILLAR product. 1990693 WASHER 50.3X78X3.4 MAT101 CARRARO STD. 11 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849