yup they are 12 cause i know i had to remove my old seats to put in 99si seats. its pretty easy. remove bolts, take out seats, clean how you like, put seats back in plug up sensor, rebolt and boom your good to go. wish i would have cleaned my car when i took my seats out too. o well to lazy to do it again. oh and if you can't lift the seats then have a brother or boyfriend take the seat out.