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I would say yes to replacement. You might try some jb weld to reattach the screw mount posts but I don't think that would hold with the vibrations and wind forces.
I would recommend replacing. I had the same thing happen earlier on in the summer. I just ordered the mirror off Ebay. The install was easy, I actually just followed a youtube video. No sweat.
Thanks for the reply, guys. I tried some JB Weld earlier, but I didn't hold it long enough. I think I'll try it once more and then replace the mirror if I have to.