Internal bar size?

[Noss4atwo]

I was going to get these bar end weights because they allow for aftermarket mirrors to be attached. But not sure which size to get? Any Help
http://www.motovationusa.com/mvstore/scripts/prodView.asp?idproduct=304

[oh9bolt]

Size C.

The bars are 7/8 that is 22.22mm. Right?