I don't believe that it came with a bolt out of the factory, because when my car was broken into I had to replace the quarter window and I first had to remove a rivet so I just put another into its place.
I recon just get a solid rivet for it, it looks the part and it hasn't come out yet.
As dods said, it came with a rivet. The window becomes loose over time because of wear. Your not missing a "secret" adjustment. Go to Ace Hardware or similiar store and buy a screw head bolt and nut that will fit in the pivot hole (it won't be big!) Put the screw head bolt down the top and nut on the bottom and tighten to your desired strength. This will allow the windows to open and keep them open going down the highway at 70 (if you can cruise that fast). If they become loose over time then you can just retighten the screw. I would also try to find a locking nut if they have them. Good luck.
You are looking at the rear quarter popout windows and not the door vent windows, right? Those parts are for the door vent windows.
As dods wrote, it came factory with a steel rivet.
You said you replaced the top bracket. Are you talking about the one on the glass frame, the one on the surrounding frame, or both? These are also riveted to the frames. Pivot rivets are available from cip1, part number C16-111-648.
There is a tension clamp on the bottom end of the window, behind the interior door panel.
The parts you have listed there are for a convertible. In case you didn't notice that...
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