Unfortunately they don't without enlarging the original hole on each side of the aluminum housing. Not much bigger, and I can still put it back to stock if I wanted, but there us some minor drilling involved.
I see you've taken off the mirrors Merlin, any reason, ?
CAG, (Steve) has a nice set of mirrors from another Ducati fitted with the front indicators set into the back, they look really nice, He's not wired them up yet, I'll take a pic next time we meet up,
Just maybe a good alternative