I am redoing my seats in my 442 and el camino, both are 87 models. I need to replace the the hard plastic pieces that fit around bolts that serve as stops for the upright seat back. They are about an inch long and fit on the bolts to cushion the seat backs when they are flopped to upright position. I also need some of the bolts as the torq heads stripped trying to remove them. Anybody know where I can get these pieces?