To finish the front seats, all that remained was the seatback covers. Don’t wail away at the retaining clips to try and install the covers, as you will damage them. Carefully snap each clip into place, using needle-nose pliers if needed, to squeeze the clip closed. New mounting clips, as well as hog rings, hog-ring pliers, seat tracks, mounting bolts, side trim, and more are available through Dallas Mustang Parts as well. You can install the side trim and seat tracks now or wait until the seats are ready to go back into your Mustang.