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Be careful! I broke one of the drivers side clips when i was installing my radar detector. Now it just hangs by one clip and has to sit inside the rubber gasket to hold in place.
What happens with mine when I remove them (I've had the driver's side A-pillar trim piece off multiple times) is that the trim piece comes out (pull out the top part, then the bottom part slips up-and-out), but the metal retainer clips stay with the car (embedded into a couple of notches in the metal frame of the A-pillar itself).
So, I have to remove the clips from the notches, slide them back onto the inside of the trim piece, then re-install it (snaps back into place).