Call the MB Classic Center. If your model is old enough (I think it is) they can hook you up with a new tumbler and key that matches all your locks for considerably less than the 100 bucks mentioned above.

__________________
Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD