i have put recaros in my car. not an easy job todo properley without the right tools. first thing you need to know is that the astinas have an uneven floorplan and the stock seats to match. if the WRX seats are a flat base it shouldnt be too hard to have proper rail spacers made up to suit however it will cost you serious $$ even more if the rex seats have an uneven base i can imagine fitting new rear seats to the astina being a nightmare as well but one can only try i guess
