The rear radius (swing) arm pivots on a shaft that can wear over time. Our kit includes the shaft, bushing, bearing, thrust washers, seals and hardware to complete the job. The bushing must be reamed/honed parallel with the centerline of the pivot hole. Cars built before 1963 need an extra 2A7325 bush for each side, as the needle roller bearing is not used. Kit contains parts for one swing arm only, use two (2) kits per car. We offer a rebuild service for customers that do not have the required tools. Just drop us a line for more details using email for below