Mechanical key, correct? If my experience with the 92 I had helps....you need to find a locksmith that carries the right kind of blanks and has a key cutter that can do the job. It took some hunting around here in RI but I was finally able to find one.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife