Try these guys:

Key Men - Keys for Classics

They made keys for my 68 230 from the codes, they have W123 keys. You may need to call to see if they have steel.

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Owner of Mobil-Werks
Classic Sports and Specialty Automobile Service
1968 230 W110 +3.5 M116 & 4-Speed Manual
1985 300TDT S123
1985 500SEC C126
2022 Sprinter 3500