I was actually just looking at mine yesterday while driving. The right side mirror body is shaped different to help with the angle, so I think they intended it for the driver...No It's not perfect. And they are just regular mirror glass, not curved like modern ones. On the left lane of highway, I can look back the right lane with just a slight lean back and too the right.
On the Duster I have the advantage of no wing window. I have mine placed same as driver side.
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