Larry, i put one on my 56. it did not fit correctly out of the box - the same gap, the curvature was not right. My body man had to cut/bend/re-weld/grind the passenger side to get it to fit. it came out great, but it was a bit of work. it is screwed to the lip above the windshield and i put some strip-caulk between it and the truck. I would tell anyone who asked this question that it is not an easy install.
visor mod you are welcome to come by and see mine if you like
tom
