Paddle assembly with sprocket.  Note that this part will only fit a Paddle King product.  You may be able to retrofit this to fit other brands. The length is 39 5/8". 

This item shows that it is out of stock on this website because you need to call to order due to the varying shipping charge. Due to dimensional weight (based on size) shipping on this item is approx. $275. If you would like to order this item, please call us at 989-235-6776. Sorry for the inconvience!