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How do you know they are most definitely in the airflow?
Mine were very similar to wagonman's- mine went up the windshield a little further and had some more "fillet" to them. Anyway, I made it two piece, left and right. After going through the rain with no wipers and no noticeable fe results I re-installed the driver's wiper and left the passenger side fill panel. On my car I have noticed, fill panel or not, identical behavior of raindrops on the windshield. That is, on about the bottom 1/4 to 1/3 of the windshield, the drops just sit there even at highway speed, whereas on the rest of the windshield they are blown up and to the sides. That whole zone of drops sitting there stationary tells me that flow velocity there is not high at all. So the aerodynamics books I read were right: there is a fairly stagnant high-pressure "bubble" in that region, on cars like mine and wagonman's.
Now, that Renault has such a shallow transition there at the windshield base that I would not want to venture a guess as to whether it has the above described situation.
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