1996 S320 rescue - duo-valve hoses and more fun

[dvdguy]

I recently picked up a 1996 S320. I've been working on trying to get things back to normal after it appears that she has suffered from some engineering shortcuts.

Can anyone help me get part numbers or diagrams of the engine compartment duo-valve related hoses? It looks like the whole duo-valve system was bypassed. not sure if it's because of a sticky valve or worse a leaky heater core. In any case, I think I'm going to need a couple of hoses to put things right in there.

I also need to fix the Rear Seat headrest release vacuum solenoids. ( the originals are broken off) - maybe I can glue them back on?

... and the stereo wiring.. oh my, that's just a mess. the original amp is gone, wires cut, most of the drivers blown except the subs on the rear deck.
I am considering starting from scratch on that one.

Can I wire the 2-ohm bose speakers in series to make a 4-ohm load for an off-the-shelf amp?

It's a good solid car with only 100k miles, so I feel like it's worth spending a bit of effort getting it back to normal.

thanks!