You can but I got mine off a member at www.riderforums.com. There is a Z1000 group there and they like bar end mirrors. The more I use them the more I like 'm . I have NO issue seeing behind me at all. They vib a little but any twin will do that.
I just installed a set of ZRX mirrors on my Versys and it's a lot better. I can see past my shoulders and since they are all metal they vibrate less.
I've been using ZRX mirrors on my last two KLR's and they work great there too.
Using the speedy extenders, it was just an bolt on fit.
Speedy does excellent work for the V parts.
I assume that they will also bolt on into using the original mirror hole as was using the OEM stock square mirror with the extender before I got the Z1000 ones.
What I mean that the Z1000 and stock mirror bolt threads are identical.