12V/1.2W is the right bulb. Mercedes uses dull bulbs (structured bulbs instead of clear-glass bulbs) in the W124...these dull bulbs are less bright and have a high(er) gray plastic socket.

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)