99 3.0 CL external window screw?

So my trusty 99 CL 3.0 is returning from the mechanic (timing belt, water pump, tie rod ends, wheel hub & bearing replacement, etc) and all should be well assuming the transmission doesn't fail any time soon. I'm at 220,000 miles, hoping for 300,000.

Here's my question:

The driver's side window has a rounded-head screw that holds the top-right of the window to the track that moves it up and down (when looking at the driver's side window from the outside).

That screw has gone missing, so the window sticks out when you put it up unless you open the door and hold the window against the car until it goes up enough to get under the rubber seal.

I have not been able to even find a NAME for this part, much less where to get it. Any ideas?

I can post pics if requested.

Thanks