I don't know the dimensions of any of the internal parts of that fan hub. I doubt that anyone else will be able to post them either. But nothing in there is particularly high precision. You should be able to measure existing parts to decide what size washer you need. Looks to me like the major problem is that nobody has oiled it in the last several decades.
You need to clean the bearing surfaces off then decide if the bushings/shaft are a tight enough fit to reuse. You should be able to decide what size/thickness the thrust washer needs to be. It needs to be thick enough to eliminate excessive end play but thin enough to assemble.
Forget about a seal on the back end of the shaft. None is listed in the parts catalog because it isn't needed. It does need to be oiled, as explained in the owner's manual.
Be sure to put it all back together correctly so it doesn't come apart. If it fails, the fan could hit the radiator.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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