Maybe someone can explain how this works, whenever i order some parts i am asked which engine, My engine is 12-059906, That means i order from 12-108987 (which covers everything below that number)is that right?.Thanks

12-108988-
-12-108987

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1979 300D.

Your engine should be 617.912 if the car you are asking about is the one in your sig.

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1983 300-D turbo
1985 300-D turbo
1959 Harley Panhead chopper
1929 Ford coupe restored
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Yes it is a 617.912 but the rest of the number is 617.912-12-059906, S/N of Engine i am thinking.

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1979 300D.

This can be confusing but after a little thought its really very simple.
All engines have a sequence starting with 12.
like 12-XXXXXX
So your engine would be preceded with 617-912-12- then a 6 digit sequence.

So the answer is you order from the -108987 series (the dash indicates UP TO that number) because your engine is lower than 108987.
likewise,
108988- has the dash at the end of the number indicating that number and everything HIGHER is in a group. the factory makes changes at some interval point and designate that point as a "cut off" point. It's of great importance to know the engine number to avoid getting a part that won't fit or work to proper specifications.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!