I have a 1981 w126 300sd. The low beam bulb burnt out, and I've been trying to find the correct replacement. There are so many different wattages and sizes, I'm not sure which to get. The outter casing says "Sylvania Halogen", yet there are 50 different kinds of just those bulbs.

Go to most any store and take your pick from the H6054 size sealed beams. That is what fits the 300SD.

H6054 is all you need to know, the different levels "standard" "x-travision" "ultra-blue" "silverstar" each cost more but give more light.

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