My wife was given a 1985 300D MB and has fallen in love with it. After sitting around for months, I started tinkering with it and have found myself strangely attached to it, too. So, I'm trying to get it road-worthy. The car runs but doesn't shut-off. After searching and finding the links for the shut-off valve, I have found several vacuum lines and connection with no vacuum lines. I have printed some diagrams but need help identifying some parts for a starting point. Here they are:

What is the round part and where does the missing vacuum line go? Also, the part directly to the left of it has a missing vacuum line, too. What is that part and [again] where does this line go?



These come directly through the firwall, I think the line with the white filter (bottom) is for the EGR, right? What is the one with the brown line coming out of the yellow filter/check valve(?) and last, what is the line that is block with a bolt (see 4-way Tee near top)?



Thank you in advance for any assistance. Hard to search for something if you not sure what it is your looking for.