Differences with respect to the series control arm

In order to realize caster adjustment, the service control arm is provided with a special bearing at the connecting point to the diagonal arm.

This special bearing has a larger bore with respect to the series control arm (dimension X). There are also corresponding bearing surfaces for the two eccentrics.

Fig 1: Identifying Service Control Arm Components And Bearing Dimension

Courtesy of PORSCHE OF NORTH AMERICA, INC.