Like has been said, 1941-1947 wheels for 16" tires were 4-inches wide, although 4.5" wide wheels were available fitted with 6.50x16 tires (same for 1948 and 1949.) By 1951 (not sure about 1950) 3100 wheels were 4.5 inches wide. There are also 5-inch wide 16" wheels that were used on 1955 2nd series 3100's, but they only had three hubcap clips. I had an assortment of all those sizes on my truck, and needed to find some 4.5" wheels for a complete set.
