Little lightbulbs for these cars are cheap. Relevant to the cruise control? My experience and what I've read lends credence.
The cruise control amp has an "electrical relationship" with the tailights. It has been discussed that some non-German bulbs have electrical differences that can cause premature failure of the cruise control amp.
My advice: Either buy bulbs from M-B or buy Osram from someone else. The bulbs in question run between $1 and $2.50 each. Last I checked on a cruise control amp, it was well over $100. In this instance, relevant or not, I simply don't see the logic in going with some generic $1.50 bulb, but some do...