I was looking to replace the large oblique stock mirrors on my 2016 Triumph Street Triple R with some more subtle bar end mirrors. I ordered a set off of ebay, which was pretty generic, but nice looking. Naturally, it had parts I didn't need and missing a part I did.
That is, it did not include a cap for the screw hole where the stock left hand mirror goes to prevent rain water from rusting out the threads.
3d printer to the rescue!
This will fit 2013 and up Street Triple and Street Triple R.