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I don't think it would hurt anything since it looks like it is designed to sit in out of the wind. I doubt very much that you would see any gains because of it. If it helps you see more clearly, it may be worth it. If you wanted to design/build your own, and attach them to the mirror housing (not stick them onto the mirror as shown in the picture) you may be able to design some benefit into them. Any benefits would likely be very small (non measurable by coast down means) if we are talking about a 1" extension.
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