You can get pretty much any bucket seat to work.
There are two issues you need to contend with. The first one being the rails/sliders. The floor attachment points are different for every car. Many times you'll need to fab new lower rails so that you can use the hardware that attaches to the seat bottom.
The next issue is electrical. You will need to figure out a way to get the wiring harness spliced in so your airbag light doesn't come on. Also, you'll need to power any curtain airbags/seat adjusters if the new seats have them.
Feb 2011 Ride of the Month ~ 2011 Hatch Nation Hatch of the Year ~ 2011 Focus Fanatics Ride of the Year!
Hatch Nation #2