honda/acura, VW/Audi, GM, Ford, toyota...all use ricaro for some performance factory seats. i can't imagine they would cost an extreme amount to purchase...if whoever is buying wants full adjustment of the seat...and having comfort being involved. i've sat in some sport seats that killed my back in just a 20 min ride to get beer...and i've been in a few civic Si/Acura RSX cars that i could drive across country in. i spend about 2 hours a day in my seat, so i'm looking for comfort personally
and yes you can hack the seat apart and use the factory seat with a little welding. with knowledge, money, time, and proper tools you can make anything you want. skimp on any of those and quality goes down of course.