They did indeed make a rubber plug for the filler hole. My COE had a factory one because it had a saddle tank mounted to the frame. I put a tank behind the seat and took it out. I. Doubt anyone reproduces one.
1947, 1950, & 1952 Chevrolet 1/2 ton
1952 GMC 450 series Cab Over Engine
1946 Chevrolet 2 Ton
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