Actually rear european lights and mirrors are the hardest quest about bodywork... Only used parts market can supply something...
Anyway you should be careful about mirrors: there're some similar parts (like the cagiva freccia c12 ones and the turn indicator support without mirror, like the ones in the previous topic are supposed to be...)
I think it's very important to find sooner the parts you need, as they're disappearing very quckly from the used parts market!
By the way, where're you from?