When a generation 3 (2013+) Yamaha FJR 1300 tips over, it is moderately common for your mirror’s mounting bracket to break. This mounting bracket is part of your front stay (aka subframe). This how to video will walk you through the necessary steps for replacing the front stay. Another option would be to remove and weld the original front stay back together.
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Rearview Mirror Assembly (Left)
Rearview Mirror Assembly (Right)