Yes, they are bolted in.. you have to remove the sail panel to get to the nuts. There is a sealant there, though. Get the old stuff off.. you can make up a ball of what's there and tack that ball on what's left and it should pull off with the ball.. make your way around getting all off the new window and the opening in the car. Ggo to your parts store and find some 3M strip caulk (what I usually get is in a blue box).. lay at least one unstretched bead around the full perimeter... two if you want the insurance, no gaps, and bolt it back in.