Mine are in a drawer since new.
I believe their function is to prevent accidental unscrewing of the nuts.
They are a requirement of the EU4 Health and Safety police, who deem that brake disc guards must be fitted 'for pedestrian safety'.
Those hub caps have nothing to do with the discs
as they're on the other side of the wheel. They are just an aesthetic choice, and - told by both MMC and the dealer - does absolutely nothing but decorate.
That's why I asked Raphael (atalante83) how they can "upgrade" the car...
