Your last picture you posted shows this part. The part # ends with a "B" so there was probably more then one kind of light socket. This picture looks more like the CMP rear diff light. But again that would make sense as the CMP trucks moved away from the rubber housing to metal housings for the tail lights.
As for the light socekt. Yes it looks original. The socket is the same style as my original tail lamp.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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