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Energy Suspension makes rear trailing arm bushings that reuse the metal parts. Prothane makes complete trailing arm bushings that allow you to just press the old ones out and press the new ones in. The Prothane ones are obviously more expensive. Unfortunately, I've never done this mod myself so I can't speak from experience. This is where others can chime in.
For the trailing arm bushings, the instructions that come with the ES ones say that a press is recommended, but you can get by with a 1/2 x 4.5" bolt and some 1/2 x 3.5" fender washers. You position the bushings and tighten the bolt to "press" it into place.