Just for general info. My 73 280C had a fogged up inside rearview mirror and the dimming lever was also broken. Just for the heck of it I tried a spare mirror for my 1986 BMW 325ES. Fit fine and it is the same width!

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.