I've bought cheap Chinese copys of Honda CT110 (postie bike) mirrors and mounts.
Then I linished (grinding belt) the mounts to be as narrow as possible and managed to fit them in.
They work perfectly, look ok and cost $5 to replace if broken.
Another option is to attach some mirrors to the hand guards. Probably need some and fabrication for a really neat job.
Bar end mirrors if you don't mind them being sacrificial. (Again, mounting will require some thought with the guards in place, but probably easy enough.)
"Illegitimi non carborundum "
KTMs- '08 690Enduro (SM conversion) '06 450EXC '04 SX525 - Motard (Yee Ha)
'96 Suzuki Bandit1200S - ATS (All The Sh*t)
'08 YZ250F -MX raced so slowly, it's a sin
'73 Honda Z50 minitrail - Road legal, Vintage, Cool