Does this video help?
https://www.youtube.com/watch?v=y8nnys0X6Io

I just used a google image search and looked for: w115 engine. If I understand which hose you are asking about, other than the fittings, it sounds likes yours starts and stops in the correct places.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).