What are you looking for? race? just making it better? lazy boy put into the car?
you can cheaply take a few various other seats and with little to no modifications make them go into your car.
Or if you have the $, take them to a upholstery shop.
OR you can do what i did, take the seats out, go buy a can of contact spray adhisive for foam and foam rubber, and about $40 worth of memory foam and a cheap electrical turkey carver and do to town repairing and adding foam. , cleaning up the metal points, im sure some are broken, weld it up and add some heated pads.
If its leather, use this.
Leatherique Rejuvenator Oil