How to fix a side view mirror?

So due to a small fender bender, not the victim but MY passenger side rear mirror was damaged. To be specific, not the glass but the end of the plastic covering is damaged. And only the part that physically attaches to the car is cracked. The mirror itself is fine and electronically functions properly as normal.... show more So due to a small fender bender, not the victim but MY passenger side rear mirror was damaged. To be specific, not the glass but the end of the plastic covering is damaged. And only the part that physically attaches to the car is cracked. The mirror itself is fine and electronically functions properly as normal. What can I do to repair it so it isn't leaning over as that is making it harder to view people on my right as I drive?
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