I have a 142 so I definitely do not have that rear 1/4 window. However, the frames around the door window and the frame around the pop out rear 1/4 window are aluminum and definitely not plated. It might be a satin finish clear coat of some kind; but, I suspect it is anodizing. Anodizing is a chemical treatment on the metal surface and not a coating. It does clean up and shine using metal polish and I seem to recall that the rag had a black oxide on it after polishing which clear coat would not do. The 164 being more up-scale may have had a different treatment.
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