eclipse gas doors have "eclipse" engraved on them, and arnt a perfect circle...and i think tiburons' gas doors form to the curve of the car, so they are kinda bent like a pringle. would look badass though probly, unbend that bitch and make it fit!
I have one installed on my ride. It was made for a PT Cruiser. You have to bend the trim ring a little to conform to the body. I also had to get a new gas cap, as the stocker hit the catch assy. for the door. I got mine from Everything Offroad, but any for a PT should work. Hope this helps.
A gas door is not where I'd invest my money, I think it ruins the flow of the car to have a little circle "stand out". Just my opinion though, if you like it then more power to ya and good luck finding what you're looking for.