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Havn't found a company that actual states 61-66 etc; but a 70's model cap will work.
Hope this helps you into thinking of trying. If you got a local supplier; I recommend going there and trying one one.
The problem we find is that there's no smooth cover's; they all got the ribbed finish on them; either chrome, or black rubber type.
Have you tried Sacramento Vintage Ford, as their catalog indicated, they sell 'cool truck stuff', original and custom. Have not found their online catalog user friendly. They offer a free catalog, have to provide your email address, had reservations, but they only email every couple months, re: swap meets and special events.