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I just use the little (2"?) round convex stick on mirrors on my sideview mirrors, and nothing can hide from those. This allows me to aim the side mirrors further back. I have overlap between the mirrors. A vehicle can be visible in the rearview and sideview at the same time, and will appear in my peripheral vision before it is out of view of the convex mirror. I use them on every vehicle I own, and never have to turn my head to change lanes.
Many people ignore the instructions and install them incorrectly. They belong on the lower outside edge of the sideview mirrors.
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