300D is a W123 chassis................built through 1985

300SD I have is a W116 chassis.....built 1978 through 1980 but the W116 chassis was in production before 1978

The W116 is about 12" longer and 6" wider...they share an engine (It had the turbo diesel first in 1978)

Very few other parts are enterchangible.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Cool, thanks.

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84 300TD 4 speed, green