Those are the two hardest pieces to find for 63 SS. Your best hope is to scan eBay every week and eventually you'll see some. Most will be used but once in a great while you'll see some NOS ones. Get ready to open-up the wallet though if you want to win them.
1963 Chevy II 400 mouldings are the same pieces, but the insert isn't argent color. You could expand your search to include these, strip off the old finish and paint them argent. Just a thought.
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