I just replaced the first one with a modified one that had the same file name, and while it shows up if you click the link in my post, it doesn't if you click the link in your post that quoted mine. Seems like lost sock in the dryer stuff to me, but rather than figure it out, easier to just post the pic itself this time.

I'm guessing the machined section at the back of the wheel was for vehicle fitments that required a hub centric ring, but as tom4b mentioned, ours are lug centric.

Anyway, the material I had machined out now allows room around the outsides and the cap ends of the stock allen head bolts on our front hubs.