Warning: All text translate with google ;-) Hello, it is possible to construct the seat a little further to the rear. I'm 2 feet tall and have a little trouble sitting comfortably. Something like Schonmal someone has done? Is a 1970 model. regards Nils
Poster must be 2 meters tall. Yes...the seat can be moved back. It requires drilling new holes into the floorboard. I would reinforce these holes if you do that.
Two meters is 6' 7" tall. He ought to take the front seat out and sit on the back seat. This scenario reminds me of this scene:
The alternative would be to adjust the brackets on your seats by either moving the mount points forwards, or adding new mount points entirely to the brackets. Having not seen the underside of a bench seat in years I'm not sure how much work this would be.
You can try just getting some spacers ( maybe 30mm ) and longer bolts to raise the seat. This won't alter anything in your car or the seat, so if it doesn't work out you can put it back to original. I raised the seat in my Ranger truck, which gave me more legroom. I used some schedule 80 PVC pipe to make the spacers. It worked great and is much more comfortable!
If you relocate the seat and drill new mounting holes that miss the original reinforcements, I think you should add reinforcement for both upward and downward forces. Reinforce for downward loads so the seats don't break through the floor and reinforce for upward forces so the seats don't break loose in a collision.