I just purchased a pair of seats from ezboy interiors. They make an aluminum seat pan that is real close to the size of the fiberglass pan in my car. I'm not using the traditional black, I was able to send them material that matches my dash and they cover the seat with my material. The cost is $739 for the pair!!
https://www.lebaronbonney.com/cart/itemdesc.php?ic=3578