It is hard to tell from the pic's, but it looks like the wheel bearing races are ok. Do you know if it is just the wheel bearings that you need?
If the hub needs replaced, I believe they need to be pressed out of the drum and a new one pressed in. The bearings and races are available as is the drum. Not sure about the hub.
Check for all parts except the hub Here
This is one way to put disc's on it.