Both the National Cycle windscreens - the Plexistar 2 and the Plexifairing 3 come a bit tall for under 6 footers. I am 5'9" and my Plexistar was cut down almost 4 inches , so I would bet an "unaltered" or new one would be just about the right size.
Most makers have measurements on their websites stating the height of each windscreen. All you really need to do is sit on the bike like you are riding and have someone measure the distance from the top of the headlight to where your "eye level" is.
Then just go and find one thats height matches your measurement.
Remember that any screen can be cut down, so if you are not exactly sure what height will work on the street, it's better to get one too tall than too short. Most windscreens will have some "play" in how they tall they are based on how you mount them and how much rake you use.
So you first should pick out what style you like and go from there.
Here is a side by side photo of my Vulcan with a Memphis Shades Hellcat on the left and a Plexistar 2 on the right :
If you line up the headlights a bit better you can see the PS2 is taller and of course wider. The Hellcat would not likely be tall enough for what you are wishing, as was on the low side for me, but did a good job keeping wind off my chest. You can check their website , but I think the Hellcat was 18" tall (again they measure from the top of the headlight)