Farmall Cub

Any one know the size right off? It only gives a part number in the manuals. Is it anything other than a standard size oring?
TIA

I have one in my coat pocket. Looks like 1" id and 1 1/8" od. Take a caliper to the shaft and double check... or I could send you the one I have. I am not going to use it this time, just the seal I got at the same time (it was just in case, case won)