Re: Alloy wheel security bolts - key mislaid - 03 W203

That is McGard lock... Aftermarket wheel lock. however, it would be hard to

buy the right key without the key code.

There is a wheel lock removal key kit to remove the key without drilling
it 
out. Expensive kit but maybe someone has it.

Last choice is send an actual picture of the lock to McGard lock and see
if 
they can match the key for you.