1979 xj12 rear

I can't find anyone that knows about these things! my pops junked a 79 xj12 that was rotting in our driveway but took the rear. I have an 88 camaro, a 413 golden lion and that independent rear with the center disc brakes. Put 'em all together and that's what I'm building. First I'd like to ask what kind of gears this thing has. Secondly, what's the differential and finally, where can I get bushings for those "traction bars"? This thing is definitely going in my rust bucket I just want to make sure the gears are somewhat of what I'm looking for and that I can even find parts for it. Any input is greatly appreciated.