Kartboy transmission mount bushings are made out of a strong urethane to replace the factory bushings that are soft, and become super weak over time. These will install between the lateral and the horizontal support of the transmission. With that said the Kartboy transmission mount bushings will eliminate the flex that is caused by replacing the factory mount bushings that are super soft. You’re going to have improvements in the stability of the drivetrain, and you will feel a difference in shifting and you will eliminate any drivetrain slop under high-performance driving conditions. Sold as a set of 4 bushings.