uh... are you studying to be a machinist or an engineer? If the latter, design your own damn hub. It's not that hard.
If you're looking to find dimensions for an existing hub, then copy it, just buy an existing hub.
This is about as basic of a design problem as you'll find. If you can't handle it, I highly suggest finding a different carreer path. The last thing the world needs is another engineer who can't design his way out of a box.
- An Engineer