My 85 originally had an AM radio, now an AM-FM mono with the center dash speaker. I found a donor truck with uncut wires/speakers with the factory AM-FM Stereo. The rears are held in with self tapping screws from the factory, no big deal and the cardboard ledge (mine is a Scottsdale) behind the seat has provisions for the magnets to go through, by just punching out the whole. My $.02