If you look at the pictures in post #8. It shows the glass attached. It is difficult to make out the order of components. I have to look for other pictures I might have. Someone might have window laying around and show it. I really have not seen any order of parts list assembly except what you...
If I don't have it saved on a hard drive.
I usually start on this site looking for information. The members here a very knowable. Use the search top right corner.
The trick is the way it was listed if it gets a hit. The lister not being familiar of the of the part or problem. Like M46 Cuda...
No.
There might be a crimp holding it. It can be seen in the picture, that I didn't move the crimps.
You might have to.
Maybe put WD 40 in the booster vac hole and move it around. Let it sit a day or two. You can see rust on the gasket in the picture.
Try bumping on the tabs too.
If you don't have this info. You will need it latter. Someone might come along that has had your same experience. I searched the site and really didn't see the same problem.
I was able to turn the front half past the tabs. I used a bar between the studs for leverage. Keeping in mind the studs might rusted. It did take some light persuasion with a hammer. But it did turn apart.
That was my thoughts also. Trying to read between the all the lines. Both of them! Text and assembly. Think it might have been done sometime in the paint line. Just might have been done at Clairpointe?
Come up with a name of the material and you will probably find it here. There are a few others.
https://www.thomasnet.com/browse
https://www.thomasnet.com/browse
https://www.mcmaster.com/
My 2¢. With the car somewhat level. I would pull the carpet back. Place level on tunnel for reference and match. Place bracket on the back side of the hump on the tunnel. As seen in the picture. Then level as check prior. Mark and drill small hole to start. Put screws in the holes so you know...