The rear side windows are bolted on. If I remember correctly there are 7 bolts on each side (4 on B-pillar and 3 at the C-pillar) that you have to undo. But first you naturally have to remove the trim panels around the windows. And to do that I had to remove the rear side trim panels as the B pillar trim has one screw located under the side trim panel that you can't access without removing the whole trim panel.