Yeah, I hate those one time use clips.
I don't have the factory service manual, only parts catalogs, but there appear to be no fasteners for that part other than one staple (#3) towards the bottom. Not sure if that staple has to come out. It looks like the same annoying clip setup my Cutlass Supreme has along the top edge. If I recall the metal clip parts have sharp barbs and dig into the plastic, so some wear to the plastic happens every time you pull it. If the plastic tabs don't break off, they usually go back on and fit well enough, but it's not something you want to have to pull often. Looks like something near the top of the quarter glass and I'd guess that's an xmas tree type clip.