Yes, that last one is the one that's missing I think. It's down inside the door and holds the felt channel which keeps the window on track. If it's just screwed to the front edge of the door then the window...being narrower...still falls out of the channel. Seems it needs either that clip..now missing...or a division bar as in vent window doors...to attach the felt channel to. Missing on both doors so I can't roll the window down w/o having it fall out of the track.
Of course you can call me Dogface

That's my handle in many places...long story.