www.car-part.com is your friend.
It is kind of hard to pick just a "hub" out of their list, because I think it sometimes refers the lockout part.
I would start calling places. It is relatively easy for someone to pull the front spindle assembly. Actually, it would be easier than pulling just the hub. Heck, they might even do it with the gas axe and *that* would be even quicker. :-)
There are lots of yards all over the country. The cost for shipping will be steep (the hub is heavy), but just negotiate with these guys. If they give yo flack, or start giving them the run-around, just call the next one on the list. Run even faster if they start trying to charge you for every little nut and bolt. It's not like they have a line of people waiting for these parts.
As for the minimum, you need a hub. The biggest problem is those exposed bolt holes are the ones for the locking hub. Those 6 bolts transfer the torque from the front axle to the hub. They are kind of important. You probably can get a junk yard to send you just the hub and they should be able to help with the interchange of parts.
You could probably get away with a new (used) hub, but you need the lock nut, washer and the guts for the hub too. How you get those, well...that is up to you.
The CV axle is going to be the worst. Isuzu really did not make them easy to remove. You can remove the inner boot and pop the circlip holding in the inner parts of that joint. You will need to probably pop the upper and lower ball joints to get enough room to get the outer end of the axle out of the spindle. It's a dirty and frustrating job.
You can get replacement axles from lots of places. Junk yard, parts store, ect. But, if you do the above method, then you will need to hope/check to make sure the new axle has the same design for the inner joint as your old one.
To get the inner axle out of the rig, you need to pull the front axle housing. Another fun and wonderful job.
This repair is going to take some time and some serious work. If you are not familiar with auto repair, it will be challenging, but not impossible.
Good Luck,
Michael
