Yes, they will fit. You'll lose the bar end(s), though. Honestly, I don't care for the chrome look of the Napoleons. The 919 isn't really about chrome, IMO.
You might want to take a look at the CRG hindsight before you grab a set of those Napoleons. CRG mirrors are top-notch quality, but more expensive. The nice thing about the CRG units is you can get an adapter that mounts them in the end of the bar rather than moving all your controls inboard and clamping directly to the handlebars
2002 919 40,000 miles
"racing is life...everything else is just waiting"