I just did the same job that you are describing. It was on a 190D. The marks are on the tubular sections of the driveshaft. On one section is a straight hash mark and on the other section are two diagonal lines in the shape of an open-ended arrow. The idea is to line the sections up so that the straight line is lined up with the pointed open end of the arrow. This may sound more complicated than it really is. They are not real easy to see.
Tom
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1993 300TE
1984 300D
1984 300SD
1976 BMW R90S
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