These appear to be inspired by Rexspeed's 3 raised groove deflectors but lack the "lip" on the edge that actually functions as part of the wind deflector. Does nothing to solve the problem. EDIT - $10 Hypersonic door edge protectors + $70 M-Sport Z4 G29 mirror caps and you can fix the problem more thoroughly and also replace the standard textured mirror caps with cheaper ones than these knockoffs.
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