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 - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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