These Strips make it extremely easy to bolt in aftermarket seats into a 996. They bolt to the floor of your 996, and then to the sliders.

These Side mounts offer a reinforced mounting location for the inboard lap belts. They are sided (passenger and driver) and are designed to adapt a "wider" seat to factory Porsche rails.

Check with your sanctioning body to see if lap belt mounting locations attached to seat side plates are legal.