ALLOWS THE USE OF A SINGLE STANDARD SERVO IN PLACE OF THE DUAL SERVOS.. COMES WITH BLOCKS FOR BELLCRANKS THAT MOUNT IN PLACE OF THE STANDARD SERVO MOUNT, BALL STUDS, AND LINKAGE, AND SERVO MOUNTS . STANDARD STEERING LINKS ARE STILL USED AND DO NOT COME AS PART OF THE KIT. DRILLING THE CHASSIS WILL BE REQUIRED TO MOUNT THE SUPPLIED SERVO MOUNTS. COLOR OPTIONS AVAILABLE FOR CROSS BAR. MAY COME WITH EITHER BLUE OR BLACK BELL CRANKS DEPENDING ON AVAILABILITY AT THE TIME. SERVO NOT INCLUDED