the rear deck in a pre 98 is flat
the deck in a post 98 has a triangular releif in the deck that allows the seatbelt reel and machanism to sit just below the level of the deck
you would also need to get the plastic cover and cut an opening in the carpet for the shelf
note the area of the red circle, pre 98 first has the flat deck and the second, post 98 has the center seat belt