Mikael, those stock 2-piece seats are the "good" ones- stronger than the later one-piece type, and by slotting the back strap holes, they can be made adjustable for rake- a little anyway. If you cut the back-strap holes into full slots and add knobs on the stock allen bolt heads, by hand-loosening the knobs, the stock seat-backs will tilt away from the firewall too. They also position you lower in the car than any aftermarket seats. I'm 6'2" and I fit ours with a helmet on.
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