Rifle, Klockwerks, Clearview, and I think Windvest all make aftermarket shields for these. I have a 14" rifle that I really like . . . had a 12" Kawi on it too (Kawi has the stock 18", a 14" and 12" I believe) that i got off eBay. Moved up to the 14 after putting on my DayLong seat as it brought me up too far above the windshield. I am 5'10" and don't notice any buffetting now (as it was with the 12" before the RDL).
Google all the companies I listed and choose what works best for you.
I have a 12" Windvest, and will probably get another one, or maybe try a Clearview when I need it. The "recurve" they both do really does work to push the airstream higher.
My passenger is out in the wind a little (on a higher than OEM Russell Daylong seat), but finds the Windvest better than any other low screen I've tried. I'd never put a screen on there that I have to look through, so she's learned to live with it.
I have a 12" Rifle on my Voyager, which I put on before Kawasaki offered it's own. I don't notice any buffeting, but then I'm only 5'8". And I prefer looking over the windshield rather than through it, unless it's raining.
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