Aren't they tapered? What part are you wanting measured, not that I have one? I see you have 3 posts here on GW, so welcome aboard. You probably didn't see the posts a year or so ago, where a couple of guys were unable to remove their ski pylons, despite extreme measures, and ended up sawing them off. My advice to anyone having one would be to remove it if you still can, coat the threaded end with an appropriate anti-seize, and screw it back in. You may still have time on a 2018.
