Rectangle side view mirror

[PalAl]

Any one using a rectangle side view mirror? I think they are about 2.5 x 5 in.
If so how is it working for you, how did you mount it and where did you get it. These stock round mirrors just don't give me the view I need for backing.

Also been thinking of 5 in round but can't imagine a one inch difference would help much.

Middle hinge placement....??