On a 99 model there are small slits under the seat in the back. These are not noticeable until you research that area. The slits will have screws in them, and they are Phillips or #2 Square drive on a 99. The screws are simply screwed through the vinyl. They are stuffed through the foam. The three locations are back left, back right, on each side, and front of the arm. Lift the cushion and probe around till you find the tiny” hole, and you will find the screws. BCB