I bought the bulb today from the dealer at a total cost of $1.08 and it works fine. I didn't get a chance to put in the vent. I'll sewe if I have time tomorrow. The bulb says "OS n3v 12/1.2" on it. Here is a pic:

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz