I don't know what you think about those mirrors, but I don't like them at all.
Changing them for a pair of Rizoma bar end mirrors was my first solution, but there are some more.
The best looking classic mirrors with adaptor for the particular BMW fitting, is the LSL Clubman mirror:
LSL-Motorradtechnik
In bar end mirrors, LSL has also a solution:
LSL-Motorradtechnik
edit: sorry, i can't copy the direct link.