The 52CA is an adapter for the 35E or 45V plumbizer to configure a “dog house” arrangement.  It can be used in the normal configuration or inverted.  It is also ready to accept a blue light.  When Mounting the cluster adapter to a mast arm pole the use of a 45BE Extended is required to achieve the proper distance from the pole.  The 45BE Extended will allow clearance for the maximum amount of rotational adjustment.