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As I recall, the mirror arm could be extended or retracted as needed
That is a side view mirror. Hate to be a dick but ... a rear view mirror sits in the middle of the windshield. Wink mirrors are an extended version of those.
get too close the centerline and that mirror will slap the drivers face
I had to use a clip on side mirror extension on my F-150 when I hauled a 20-ft RV trailer just to see what was behind me. This may serve a similar function.