Yeah, on these, if it's not corrosion, it is almost always that the cylindrical walls of the bulb seats are too big and need to be closed slightly with a pair of pliers wrapped in a rag (while the bulbs are out). Close them just enough that there is pressure on the side of the bulb base when the bulbs are inserted. If the bulbs don't fit tight, they will not ground.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles