Joe, 15 1/2 is stock size. This one on mine is 12 1/2. If you still want to swap, I am game.
I had my wife out in the garage at 1:00 am this morning holding the windshield up over the one thats on my Interstate so I could check it out. The one on the bike is about 4 inches taller and 2 inches wider.I was going to take it off and swap'em out to see if I liked it better . Two of screw's just spin and will not come out

I'm claimin' this windshield will not suit you Dave as tall as you are you're still going to take a head blast. I checked on-line and I'd say you need the replacement thats 6 inches taller than the stock in order to kill the wind that's hitting you .