SuperPro's fitter friendly complete rear trailing arms offer not only a significant performance and durability upgrade - they also offer an easy DIY or professional install. No pressing in new bushings - these arms arrive fully assembled with pre-installed SuperPro bushings and new ball joints. The large pivot bushing in these trailing (also called blade control arms) arms are large, soft and heavily voided from the factory. Because they are worked hard they can also wear quickly and replacing the bushing alone is time consuming. SuperPro offers complete arms with pre-installed bushings as not only a complete upgrade but also a quicker and easier installation. We've worked hard to make these a huge bang-for-the-buck upgrade with fully upgraded and outfitted arms offering a front end refresh for your ride!