I'm guessing they are made out of the same pot metal as those on a 67-68 Firebird. If this is the case, many years ago I polished a set by stripping the paint, then using 600 grit paper up to 1200 grit paper. This was followed by using a buffing wheel on a bench grinder and finalized with clear coat. They lasted three years without any degrading in brilliance, and looked just like chrome.
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