Well, it started to drizzle outside but I had already removed the door trim and insulation, (drivers side front door). The insulation removal was the tedious challenge, trying not to tear it or cut it while cutting through the adhesive.
I found a piece of black plastic in the door well about 4x5", with a broken edge on the long side. There is a 2" neoprene type gasket applied to the edge opposite the break that looks like it was used as a cushion stop. Is this the up stop? I couldn't tell where on the window assembly it went and the Haynes book and FAQ doesn't have a detail. The window looks like it will easily come out of the track and the channel removal dosen't look like a problem with the help in FAQ.

A few questions, please:
How is the window reinstalled into the channel part that holds it, and how do I keep it there? Haynes said to remove it "use judicious use of a rubber mallet", and "Refitting by reversing the removal operation". It looks like a just a rubber U strip in the channel.
Where can I find a replacement for the piece of broken plastic part that could be a stop?
Every thing else looks solid, motor mounting and the tracks, but I can't determine if I have another problem that caused the window to separate from it's channel.

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Tom F '95 945, lein holder on a '95-944Ti, & RIP '78-245

I had removed the window and the window lift, reinstalled the window into the lift with a little 3M gasket cement and attempted to put the lift back into the plastic guides. Impossible! It looked different from the Haynes photos. There was nothing to remove or drill out to allow the necessary maneuvering.
I removed the window and was able to remove the lift from the window, luckily, because the glue didn't fully cure. The easiest way to reinstall the window is by putting the window into the lift, with the lift installed on the plastic guides, (tip 1). It was a little awkward but I was able to fully seat the window into the lift. Make sure you mark the location of the lift on the window before you clean all the grime off, (tip 2).
The broken piece of plastic was from the door latch dust cover. The window lift broke it after it had separated from the window.
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Tom F '95 945, lein holder on a '95-944Ti, & RIP '78-245