they are made by mcgard. you can order them from BMW dealer. takes 1 1/2 weeks to get. in your wheel lock packaging there is a white card with a serial number and a julian date stamped on it.
may look like this.....83739a044 <--- the 044 is the wheel lock code.
you can order that direct from mcgard only if you have the julian date code or let the dealer do it for you....it will take the same time and the charge is the same regardless.
Check the front door pockets for your wheel lock, it's often stuffed in there without you knowing.
hope this helps.