are you serious....???...
We always take out the reflectors between the rear lights as soon as we get a car in which has got that! It doesn't look good on a benz (but taste a matter of personal opinion!).
Go for the suggestion Ashman wrote down. The body color inserts look very good and were used by mercedes as well (on the coupe and convertible). Add on some taillights and you will be better of as with a reflector...(this is just my opinion).
with a minor 600+k