About the only place for any rust in the oil cup to have come from is from the walls of the air cleaner, the intake pipe down the center, or from the "wool." The latter two are more likely.
If yours is the typical Donaldson air cleaner, resembling a muffler with a cup at the bottom and a narrow intake at the top, it will use the "wool," which would remind you of one of those copper- or steel-colored kitchen pot scratchers, though not as tightly woven or packed.
I hadn't seen the stuff offered, and I expect it would be quite a tedious job picking out the old and getting the new in densely enough to do its job. I've got my doubts, but if it works, great. As long as the existing "wool" isn't crumbling or flaking apart and you have adequate oil in the cup to be drawn into it by the engine vacuum, slightly rusted/pitted wool might actually be marginally more effective than clean and new, by virtue of having an increased surface area to hold oil and trap dust.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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