A medical device support system adapter for connection to a load balancing arm of a medical device support system. The adapter includes a body having a central axis, a connection component at one end of the body and an interface at an opposite end of the body. The body is rotatably connectable to another component of the medical device support system. The interface is connectable to a hub of the load balancing arm of the medical device support system. The interface has at least two mounting bolt holes equally angularly spaced apart about the central axis such that the body is connectable to the hub of the load balancing arm in at least two different angular positions of the body about the central axis.
