O.K., judging by the photos I agree you have an engine swap here, Pic.#2, did you put your finger up behind the turbo drain tube to see if the oil vapor tube nipple is there ? .

NA engines have it and your photo appears to have the turbo oil drain so the vapor tube nipple should be there if out of site .

Once you figure out what you need this should go to - gether fairly easily, I've replaced the O-Rings and damaged vapor tube and am still quite pleased with the lack of oil drips almost 200,000 mile later .

IIRC I had to take off the intake manifold, that's much easier than it looks at first glance .

I hope you have the gone missing engine shocks, failure to have them means you'll soon need motor mounts .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better