The bearing shafts and the motor stators are mounted to the bearing caps.
Approximate Dimensions: 2.100 inch diameter
The gimbal ring allows the seeker to move in elevation. The size of the gimbal ring is constrained by the size of the missile body which has a 5 inch outer diameter.
Approximate Dimensions:
The payload ring is now obsolete. Originally, the primary mirror would have been mounted inside the payload ring (inner gimbal ring). Now, the primary mirror itself will be the inner gimbal.