Welcome to Allpar. The 1966 parts book shows an upper door trim panel finish moulding, but no lower. I'm going by the RP-23 as no convertible was shown. A convertible would be RP-27.
The 1967 parts book shows an upper only and gives a Rt. & Lt. part number printed for the first time.
I would see what a body/upholstery shop supplier has in the way of chrome stripping. For looks & continuity, you may want to replace all door trim mouldings?
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B = 1st time part # published.