For those who have removed stock mirrors

[hansum-mane]

If you want to block those holes left by the stock stalks, check out these Yamaha R3 block-off plugs that fit perfectly.  I think I paid about $10 after tax for a pair at the Yamaha dealership.

www.partzilla.com/parts/detail/yamaha/YP-90338-09012-00.html

[AshesOfAnother]

Sweet!

[sp3ak]

Cool, I tried a plastic cap from Lowe's and it didn't fit. I never went back to dig around to see if I could find something else.

[sp3ak]

I wanted to bump this thread and say that I ordered those and they fit perfectly. Nice and snug fit, took seconds to install.

And here's a few random keywords to help for anyone searching:
mirror hole plugs
mirror block plugs
mirror plugs
plug mirror holes
block mirror holes
other things with block and plug in it