Thank you to all for your comments and suggestions.
I just ordered the Wind Wings from SxS Windshields in Utah.
The owner has a General, so the fit shouldn't be an issue. I was also impressed with his (the owner's) openness and honesty when discussing his product. Wish Verizon, etc. could operate like that.
Sure I could have built them myself. But in my experience, unless a product just doesn't exist, it usually costs me more in the end to go the DIY route.
It will be awhile before I am riding again, but I will try to remember to post back here what my impressions of the product are after I have used it some.
This is my initial review of the Wind Wings that I ordered the other day from SxS Windshields.
They arrived promptly in two days (Utah to Oregon).
Look sharp with the tinting and USA logo.
Installation took about 20 minutes once I figured out how I wanted to do it.
The kit comes with two different style of clamps, a traditional hose clamp and a black clamp that you put a bolt through. Initially, I tried to use the black clamps, but decided it was too much fiddling to get the bolt through the holes in the clamp, so I switched to the hose clamps. I have a fold down glass windshield but, I think, the black clamps would be the way to go on a fixed polycarbonate windshield as you could drill holes in the windshield and put the bolts through those holes. If you do this, you may need longer bolts (assuming installing on a Polaris General). The supplied bolts work, but it's tight getting them started.
Took the machine out for a quick ride down the road.
It is cold right now, so I couldn't test for how much of a difference they made or (since I was on a road) if they reduced dust.
I found that at about 15 mph there was a noticeable breeze blowing into the cab when the vent was angled for this. With signafantly more breeze at higher speeds. When I set the vent so it was not angled, "I think" there was less air blowing across my left (drivers side) shoulder and I would think it would be "a little" dryer in the cab in the rain/snow. The vents angle sufficiently so that you can even blow air onto the inside of the windshield if you want.
I guess if I was being picky, I would't like the hose clamps. But this isn't an issue for me.
When I haul the SxS on my truck, I have an American Flag windshield cover that will, undoubtedly take a little more fussing to install.....but this would be the case with any vent of this nature.
In conclusion, I like them. They look good and seem to function exactly as expected. And I look forward to trying them in warmer and/or dusty conditions.