Exclusive to Quintrex, this is a fantastic product and allows you to launch and retrieve your boat on your own with ease. We put it on almost all of our stock boats now as standard as we know people will want it. It comes with both parts and can be retro fitted to most older boats and trailers. Note: The gap between the two arms that hold the bow roller must be 100mm as per image attached. **If your gap is 75mm then this unit will not work.