Motor Stop assists in centering your boat from front to back. Designed specifically for boats with sterndrive or outboard motor. Motor Stop for 35120 Series is part number 60-2078, for 4500, 4500H, 5500, 6500H Series Lifts is part number 60-2076. NOTE: ALL BOAT LIFT ACCESSORIES ARE AVAILABLE THROUGH OUR LOCAL 'FENDOCK' DEALERS. IF YOU NEED ASSISTANCE FINDING A DEALER PLEASE CALL US AT 1-888-336-3625 OR 613-722-6581