I happened to be reading a posting by somebody in the UK and he stated that he had a National Cycle Plexistar 2 on his ZR-7 and really liked it. He felt it extended his driving season, and it was not noisy. That got me curious and I looked around on their web site and I had a hard time finding the different models listed on their web site too. However, I did see a listing by make and model on their site and I found several products for the ZR-7. I did buy a Plexistar 2 for my bike and I like it a lot. I still use some earplugs just to cut down on the wind noise on my helmet's visor, but I don't really need them. If I lean forward a little I can get in a dead air space and there is zero wind noise. You can really hear the engine good too, I like to check just to make sure all is well. I also like the wind deflectors in front of the handgrips they are great for cool weather. I live in Michigan and the best days now only get up into the mid 50s, and I still go riding. I agree with the guy in the UK the Plexistar 2 has increased the number of days I ride too. Also, the screen is completely clear so it really does not change the looks of the bike much.
I had the screen from Kawasaki for Zr-7, it looked cool and it saved the wind against the body. But the wind noise was just terrible!