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Hi C,
I guess you could paint it with a hammered or wrinkle paint, or have it rechromed, or buy a new one. If you've made some other changes to your engine or compartment maybe you could pick an idea from some of those new parts.
Alan
Depending on where the rust was located, you might be able to put a set of crossed-flags (i.e., gas lid emblem, etc.) on it and cover up the rust. Other than that, it would cost you more to have it rechromed than to just buy a new one.