I have a fabric wind blocker for my R171 and I see it's the standard for the R230. I've searched for, but havent found, a clear Lexan alternative for the R230, does one exist?

I'd prefer something clear that I could attach to the safety roll bar.

On two other cars I noticed that it is essential to have the portion behind the wind blocker screened off horizontally. Alternatively, and in one case additionally, we had a black flap hanging down from the blocker, behind the seats. That hanging screen would be firmly blown forward, against the seats, while driving.
You might want to consider that, when you’re thinking about a single acrylic or similar screen.