i recently purchased a new set of black mount bushings to upgrade my steering system in my automotive. As a result of my tests, I determined that these Prothane bushings are top-notch! They significantly reduced the harshness of my ride and improved the overall handling of my sports car .The installation process was not easy but the results were well worth the effort. The only downside was that they are a bit pricey, but the quality was worth the investment..