The trim holds them in. As far as I can tell there are no other fasteners other than the trim holding it up. There's also a pocket for the radio if you don't want to cut the dash. I didn't want to move my eyes that far off the road, and I didn't want to have it up there saying "Steal me! Steal me!", so I cut the dash and put the radio in the dash. Anyway, here is the radio pocket. It's in the center.
