Get a "BMW" Smart repair done. Will cost you approx £50 and put the wheel back to as new condition.
If you do not fancy that, Titanium Silver is the closest colour match to the wheel paint I have found.
Le Mans blue/ black leather with Aluminum trim/ privacy glass/ xenon's/ black line rear lights/ OEM 18inch M Sport wheel upgrade/ PDC/ blue tooth/ Hi-Fi speaker system/ heated front seats/ storage pack/ auto lights+wipers/ green sun strip/ OEM boot spoiler/
external mirror package.