I've got the acerbis rally guards fitted (same as the TT items), but even after fitting wider bars still needed to trim the levers to allow them to fit.
There's handguards made by a company called "cyrix", that are designed so you won't need to trim the levers.
IIRC you should be able to extend these up if you need. if i knew about these at the time, i'd have gone for them.