may want to try the dealer and give them your vin. Other than that you will have to get a new ignition tumbler and switch that comes with a key. You will also have to change all your locks too.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)