[Perfectlap]

now that's a first! The GT3 seat as you know bolts onto the exisiting mounting points as the OEM seats, No need for aftermarket rails. The stock seat at its lowest position is the about the same height as the GT3 seats once they are bolted to the floor.
are you sure these seats migt not be aftermarket replicas? There should be a serial number that begins with 996 on tha back of the seat. I will check mine to verify. They should also say Recaro on the back.