I have Kappa E21s (same as Givi versions) on my side rails and they sit out as far as the standard mirrors. Wouldn't fancy anything wider (tho it may mean having to pack very smart with the reduced carrying capacity). You could then compensate with a bigger top box and / or tank bag setup.
tmation..... off topic..... you selling the skunk after all these years...... i still got mine..... dont ride it much these days, as i got a lighter more agile street triple, but cant bear to part with the old girl