I bought these to replace my old ones which have a single L-Bracket design. They stopped holding the adjustment and vibrated badly while driving. The new ones with the crossbar almost completely removed the vibration, much better. Also note that both mirrors are slightly convex when purchased, creating a slight fish-eye effect. I wasn't keen on the feature at first, but I've gotten used to it and it actually offers longer range and reduces the blind spots that are usually present in the driver's side rear view. Overall I am very happy with the mirrors.
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