Well, us car nuts recognize the 1939-1940 Ford (bodies) as the same, but the 1941,
carried through WWII and 1948, is significantly different. !939-40, like the 1932,
is one of the iconic choices of hot rodders. A friend of mine has owned or owns all
of those cars including the 1955 and 1957 Chevrolets. I can't use 1941's. Chevrolet
did carry their 1940 body into 1941, changing just in time to make most of their 1942's WWII staff cars. They, like Ford, did not change the body again until 1949. I cut off at 1940 because running boards were dropped after that, and, IMO, the cars became bulbous. Also a few other orphans, such as Graham and Hupmobile made
it through 1940, and LaSalle was last built in 1940.