If you want to keep the seat adjustable for taller drivers, look at the mounting bracket that the Porsche 914 used for its seat. As you slide the seat forward on the runners the seat gets higher. There is also a 4 toothed cog for additional seat tilt. The tracks are available on ebay and will fit aftermarket seats (the toothed cog will take a mounting bracket - just be sure to get all the pieces.