Start calling your local locksmiths. Some still have blanks and the mill for cutting them.

I found a guy in Milwaukee on Lincoln Avenue. I think I made an extra 2 sets for each of my older cars when I found him.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport