Window part query

Maxcamp

These bobbled out from the front window top aluminum exterior extrusion when I wiggled it to investigate leakage.
They seem to fit into each end but I was unsuccessful in determining just how.  The window slides left and right in its extrusion, which is not desirable.

Side windows don't appear to have these.

Can someone take a picture of how they fit into the front outside extrusion?  Thanks.

2021 320s boondock 

BandB

@Maxcamp I hope these pictures can help you.

BandB

@Maxcamp I should have added that we have a 2022 T@b 320sBD.

Maxcamp

@BandB, thank you!  I would not have guessed these clip solely to the plexi window and do not insert into the aluminum extrusion.  Extremely helpful. 

I'll need to glue these in, popping out too easily.  I wonder if they used adhesive or tape originally.
Needs to be removable so will use a dab of Geocel caulk.

My guess- Nucamp or the window manufacturer threw these on rather than use a setscrew or glued block to keep the window from sliding out of the extrusion.  
My truck contractor cap has a similar type of extrusion for the aluminum tailgate that flips up.  However it has a center setscrew to keep it from moving side to side. Nucamp could have used a setscrew against an aluminum pressure plate, to avoid penetrating the glazing and hold the window securely against sideways sliding. 
Or a gasketed screw head.  I may go that route and dremel a slot in the extrusion for the screw shank to rotate through.  On a breezy day I don't like my window shifting around laterally.