Universal spoiler scrren

[fazersharp]

I wouldn't touch that Chinese sh1t with a barge pole, likely to break whilst you are fitting it. I always tell this story when the question cones up. I brought a double screen and found it no different to the OEM one, got everything ready to swap and rode a test route came back and quickly swapped and did the same route same speed and could not tell any difference. Couldn't be arsed to put the OEM one back on and sell  the D/B so kept the OEM as spare.
The D/B looks better I thinkHere is a picture of mine, if you look at the end of the actual fibreglass fairing you can see that the screen starts flush the end, now have a look at other forcers bikes and you will see that some D/B screens start past the fairing and are more aggressively upright than mine which I think is the reason mine is not so effective.
I brought mine second hand - maybe the fella sold it for the same reason, the make is something like  nuVo but the name has long since been polished off.
I don't mind the wind blast as IMO its all part of the experience - feeling the air. ( I am 5'8" ) but have longer arms than my height would suggest so I may be sitting slightly more upright to start with. 

   

Now look at this foccers blue bike it looks like the D/B screen is at least 2 inch higher that the end of the fairing and more agressivly angled.