These extensions work well, doing the trick for easier backing and seeing around the sides while on the road. One of them tends to slip about 1/8"-1/4" when the mirror folds in. Seems to be related to he tension of the extension housing touching the side of the door when folded in.
Also, the LED signal lights have cutouts so that they still work, but the entry assist light on the bottom of the mirrors is covered. You could probably cut that out without a negative impact on the extension.
Overall a good investment. I would recommend.
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