Safest bet is a 91 to 94 xploder, grab an axle that has the same gear ratio as your existing rear axle. You might as well pull the rear axle off of the xploder, you'll be fixing your old one soon enough, get both projects out of the way at the same time.
Get everything they will give you at the junk yard. Hub to hub. Get the radius arms, bushings, and hardware as well. And all the miscellaneous hardware that comes off the donor vehicle. Its better to have parts to throw away afterwards than to lack the parts you need halfway through the project. You will be able to use your existing break calipers, so if they don't give you those, then don't sweat it.
The biggest suggestion I would have for you. Would be spell check. You have it, so use it.