In regards to the A/C system, my advise would be that if you have to have A/C, you would be much better served getting the aftermarket A/C setups now available than trying to piece together an old antiquated system that is inefficient, hard to find parts for, and is unable to run any coolant that you can readily find.
The window piece on the passenger side that you are missing is called the division moulding, and is an easy part to find. Before putting out a lookout for it, look down inside the door, it may be there. It is held on the glass by use of butyl rubber tape, and they often come loose.
Looks like you’re also missing the upper channel seals that the windows roll up into, those are readily available in the aftermarket from places like Steele Rubber or the like.
