If it looks like this, Phil has them for $118 and you should be able to find one in a wrecking yard 1968-1973 220, 220D and the 230.



Click the buy parts link, select 1973 and then pick either the 220 or 220D to find the flasher relay shown above.

Michael

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120