I removed the stock seat in favor of a OMP "King" one piece side mount fiberglass. I couldn't use the stock slide rail. I tried the slide rail from OMP but the bolts were too small and larger ones would not fit on the OMP rails. I used OMP's aluminum side mounting kit (666LE.) You will have to drill some holes in the kit to match it up to the 4 holes in the floor. There is no need to use the stock spacers. The two outer holes go straight through the floor to a lock nut under the car. The two inner holes have bolts that screw directly into the frame. I replaced the stock bolts with shorter ones because the stock spacers weren't used. The seat and mounting kit were purchased from
The picture below is not that good. I used a Polaroid, time to get a digital camera.