If airbags are that important for you, then just look at the 560SL. Although I think I read that Mercedes offered driver airbags as options in '85. Not sure if this was true for the 380SL.

A "mint" '73 would be hard to pass up, unless the asking price was too high.

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino