If you didn't install them you could have non-Toy seats in there. I installed a set of 3rd gen truck seats into a 2nd gen truck and they were fine for me at 6'2" and a bad back that doesn't bend anymore. The only seats that I installed in a truck w/the results that you have were '02 Honda Accord seats into an '87 truck. It was hard for me to get into an out of, and had it not been an X-cab my head would have rubbed the roof. Fortunately the buyer was only about 5'5" and thought they were perfect.
You might take some seat-to-roof measurements and compare them to what others have. If you are over 6', you should look for some Supra, Celica, MR2, or Prelude seats. You sit lower in these seats then the truck seats, which gives you more head room, and since they re designed for 2 door coupes, you get more leg room w/more head room.
