Re: 1939 1940 1941 firewall wiring kidney shaped cover
40 Larry I have attached a photo of all the cover styles I have at the moment so you can compare the differences. I do not have a 21A-14600 right now but it had only two wire holes and was correct for Ford and Mercury.
Rockfla if you look at the firewall on the engine compartment side below the voltage regulator where the wire harness from under the dash connects to the wire harness for the engine compartment you will see three small holes for the screws that hold the wire harness cover. I have had at least six 39 - 40 Mercury covers and all have had only two holes for the wire harness. Two of the covers were early and the balance later. Looking at all the covers you will see all have the same location for the screws. Hope this helps.
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