I have both a 603 015 02 01 and a 603 015 00 01 if anyone wants any comparison pics. There is a difference in the ribs behind the tensioner threaded hole. The first number listed was off a 3.5 factory rebuild.

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1990 300e 230k (old reliable) sold
1987 300D 230K sold
1987 300D 232K 5 speed
1998 E300 140K