Anyone know that there is a plug that is supposed to go in there? It is made of what appears to be rubber which would explain why they aren't found very often. Rubber does not last anywhere near 70 years.
I have one. It is black and has a crown on the exposed surface. Its density is similar to a hockey puck.


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission