I believe you should go to your local Mercedes dealer.

As someone mentioned, it will be good to take your title and registration. The Mercedes VIN record for the car should have a key code, and new keys can be made from that code. This will work as long as the key cylinder has not been changed in the past.

It will probably take some time to get the keys - they may or may not be able to make them at the dealer.

Good luck and let us know how it works out.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles