Not sure exactly what your question is. Are you interested only in the spare tire bracket for a shortbed with the spare tire fender cutout?
According to the people that sell them the stepside fenders themselves are the same from late 54 to 66. Not sure if it's what you're stating above, but the left rear fender with the spare tire cutout is different between the long and short beds. The long bed mounts the tire lower. I don't have a side mount spare so no first hand experience with the brackets. Hopefully someone that has one will chime in.
