They are fed from a central lamp that uses fiber optics to transmit the light to each switch. Called the "octopus", it is most likely buried within the dash, centrally located behind the center console, maybe on the a/c plenum above the radio.

Happy searching!!

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Chas

Had a 380SL, 450SL, 380SEL, 420SEL, 500SEL

Got a Euro 500SEC right now.