You are correct on them being called a narrow wheel hex. I work in the auto parts business, and we refer to that part as a hub, so that is what I call them.
No problem on posting this up. That is part of what these forums are here for, besides just ragging and dogging on people. I'm glad Shaun got you hooked up. He was a great help when we spoke, and wanted to get everyone taken care of.
Stephen