RPM HPI BAJA 5B & 5T REAR UPPER & LOWER ARMS BLACKRPM Baja rear A arms start with the basic geometry of the stock arms so they are direct replacement parts no additional parts will be needed. However, RPM have made a number of modifications to the arms from there to improve performance and durability. Features The shock mount on the lower A arm has been moved forward by a full to eliminate the severe rubbing issue of the wheel at the shock mount that would cause stock arms to break. By moving the