pin size
Hi dan:
Yes, it is piloted. You may want to get a micrometer (10 bucks at harbor freight) to measure diameter of pilot and shaft where it meets butt. It is a 5/16 and looks like X 18, but your count will control; you could also go to home depot and check it with a nut, but screw on very carefully. Or could check by counting 9 in a half inch to confirm.
Good luck