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The original grills were plastic, and I've never seen them offered in chrome.
You might be able to get your originals chromed. There are companies, that do chrome plating of plastic. There is (was) a Chevelle company in Mass that did plastic chrome parts. They replated the instrument clusters of 64-65 Chevelles, along with other parts.
I don't recall the name of the company any more, but I may have it around somewhere.