OEM square nose cable is what was recommended to me when I built my FS-2's. That recommendation came from Jose at RRP. You wont be able to run the steering cable through the entire length of grey tubing. You have to cut a small hole in the tube (inside the hull) and feed the steering cable through it. The cable will then route over top of the water box. This will shorten the route the cable has to take and the square nose cable will fit. The cable will then route between the engine mounts on the carb side of the motor. I can send you pictures if it will help.