I've found two part numbers for the warning triangle. They are "000-590-51-12", and 000-590-54-12". The bracket's part number is "123-890-00-14".

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.