I WOULD THINK THAT THE 1946, 1947, 1948 and 1949 MODEL 201 would use the same gas tank.
THE 1939, 1940, 1941 and 1942 MODEL 201 might (?) also use the same gas tank.
I have a fuel tank for a 1935 Diamond T 211AD. It has a small hole punched in the top that could be repaired by a shop. If that is of any use please contact me by email at fredpuhn@cox.net or by phone at (619)475-1155. I am in San Diego.