VW and Audi have similar keys. If you strike out with MB, maybe another make dealer has the equipment to cut a key for you and put it in a flip-out box. If you have multiple dealers in the area, it may be necessary to try them all. Only one of my 3 local MB dealers has key cutting equipment. The other 2 order keys from some far-off land.

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Rick Miley
99 E300 TurboDiesel
00 Jetta TDI