Did they come with anything? If not, go to the site you got them from and get the brackets for your year car. Aftermarket seats will all attach the same way to the brackets, so just about any kind for your car should work. Heck when I put seats in my Fox, I made the brackets out of an old pair lying around.
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3
***resident gun idiot***