I also have the convex stickon that Patrickt has and it works nicely for merging to the left. If a car can be seen in the mirror, then they are too close to change lanes safely. For longer views to the left, I have a billet wind wing mirror from DreamCar company. Really nice mirrors, good view and are made for left and right side.
For changing lanes to the right, I usually just look over my shoulder and not use a mirror.
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