This is funny. This was this weekends project. I purchased them from two sources not knowing any better. First I ordered them from PST however they only sent bushings not the bracket. Second I ordered them from the f body web site. Come to find out all you need is the bushings from PST and they will work with your factory brackets. BTW PST sells graphite bushings which have less of a tendency to squeak like the polyurethane ones do.