That god blessed did it again! Your Buddy was knocked over by your paralallel parking impaired neighbor again. This time on the left side. Its ok though, because if you head over to Rob's house, he'll have a left hand mirror replacement for you!
If you need a complete set because that neighbor got out of his car, put your bike back up, and then knocked it over on the other side, you can get those mirrors right here:
Or In Chrome
Diameter Mirror Head: 4 1/4 in
Nut Thread: 14 mm
Thread Pitch: 8 mm