Loren

Hi Bob,
The 50 Windsor chassis I saved from the scrap heap has a bar ( Sway Eliminator ) that is 0.744 inches in diameter and is a direct fit for a Plymouth ( at least on my 49 ).
It seems the Imperial was a wider car and had to have a wider bar.
A consultation with a spring shop would be in order. They routinely reverse the eyes on hot rod springs. Actually they don't reverse the eyes they re-arch the springs so the eyes are on the top instead of the bottom. It's more of a Blacksmith job than a metallurgy thing. ( That is they heat it up and bend it without any heat treat involved )

From the photo shown, I have a question. Is the other end on the road draft tube plugged?
 
Positive Crankcase Ventilation if not done right is just a vacuum leak.
Vintage Power Wagons sells a kit you might want to examine. Also there are instructions ( Service Informations ) in the down load section of this site.
I believe they are the most down loaded item.
The PCV valve's function is to block the pressure from an intake backfire from the crankcase, so whatever you use you have to make sure it's pointed in the right direction. Otherwise you end up with oil leaks from places you didn't know could possibly leak.
Not to get too into the weeds, but there are two types of PCV systems.
One uses the Oil Filler as a breather, where air can enter the crankcase ( or exit if there's too much blow by )
The other is a closed system which has a tube running from the Oil Filler to the air cleaner, thus anything that comes out of the crankcase gets burnt.
Generally because the Blow By gases have products of combustion and unburned fuel in them, the engine sees what gets sucked in as fuel. So it doesn't need any radical air/fuel adjustments when you add a PCV system.
As I said done right and a PCV system is a very good thing. It removes the water vapor which creates sludge. Most race cars have PCV now days.

The story of the VW dates back to 1925 when Dr Porsche had an idea for a "people's car". The early version had a 2 stroke engine in it as I recall and it might have been air cooled. When Hitler started building the Autobahn system it was felt the 2 stroke wasn't up to the job so they hunted around for another engine. Tatra had a flat four air cooled engine that was well proven so the Germans arranged for a license. I have actually seen a Tatra flat four and it looks like a VW on steroids! Much bigger and stronger in every way. However, the war got in the way and Volkswagen never paid Tatra. After the Soviet Union fell and Eastern Europe no longer had to deal with the Iron Curtain, Tatra sued VW for royalties on it's contract and won. VW at the time was expanding by acquiring smaller auto makers and Tatra became one of them. I have no more information than that and I would only be guessing as to this car's identity. 

Here’s a tip.
in your photo you can see an arrow on the anchor bolts.
Before you take anything apart, mark the shoes and mark where the arrow is. Since it is so easy with phone cameras take a picture as well.
After you change the cylinder (s) put everything back the way you found it. Shoes in the same place and arrows pointed exactly as they were.
This is the only way you can get the adjustment right without the special tool to center the shoes.
You might scan the shop manual before you start to visualize what I am talking about.

Here’s a tip.
in your photo you can see an arrow on the anchor bolts.
Before you take anything apart, mark the shoes and mark where the arrow is. Since it is so easy with phone cameras take a picture as well.
After you change the cylinder (s) put everything back the way you found it. Shoes in the same place and arrows pointed exactly as they were.
This is the only way you can get the adjustment right without the special tool to center the shoes.
You might scan the shop manual before you start to visualize what I am talking about.

Well....On my 49 the switch is part of a cable that connects to the wiper motor.
I can't imagine it is much different on your 48.
To remove the wiper motor you would take the switch out too as it's easier to then remove the cable.
My parts book says: code 23-67-188 CONTROL, Windshield Wiper 1941-48 All with Vacuum Wipers P/N 898-522
That should get you close. The code will tell you what section (23) of the parts book to look and the location.