I walked outside in the garage and did a quick measurement for you(of an actual M3 stock, not a mirror replacement on a 325 or something). Yes the drivers side is longer than the passengers side by like 1/4-1/2 inch. Not much, but noticable if you look at them. My guess is that they do this because of angles and such for best visability because the mirrors are smaller. Who knows.
It would make sense. My roomate drives a Mercedes E320, and his mirrors are completely different. The passenger's side is much shorter than the driver's side. I guess it's a German thing. Could be best viewing, parking, or just to screw with American drivers!?
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