I don't believe that any of the 2 door sedan 300 series door panels are reproduced. With the '69 300 Deluxe SS396 Chevelles it's a real problem. If your originals are not in good shape, then you are in for a very long search to fine something acceptable. You'll just have to search the web, wrecking yards and magazines. In the last 8 years I haven't seen any for sale in any condition.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.