Notes: 199-0689 FLAT WASHER SHIM 50.3X78X3 MAT101 STD. C is original CATERPILLAR product. 199-0689 FLAT WASHER SHIM 50.3X78X3 MAT101 STD. C1 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849