Hello, I am thinking of replacing the stock 14" wheels on on my 1965 mustang with the optional style steel wheels that were available in 1965. I believe they were called 55 series style steel wheels. I am not sure of the size that will fit. Should they be 15" or 16"? Also, there seems to be different manufacturers that call their wheels style steel wheel. I don't know which wheel is the correct one that was available in 1965. Any help is greatly appreciated. Thank you