My problem is more fun. I have a 1981 280SE Euro model that was brought into the US through Florida in 1986, so it was converted to US lights. The driver's side headlight plug is missing its holder, the individual wire sockets are just pushed onto the terminals on the headlight assembly.
The low beams are dim and yellow, and when I pull the switch for the fog lights, the fog lights don't come on but the headlights go to high beam.
In the short term, I want to make the lights I have work properly, and in the long term I want to switch the car back to Euro lights, and make the vacuum adjusters work again (I have the switch on the dash) and the headlight wipers and washers as well.