Two left hand axles will work. the Mustang rear is wider than the Ranger/Exploder rear. if I was gonna do it, I would call up Summit Racing and order up a pair of Superior axles in 31 spline, then you get all new stuff. there about $150 new. Also, look for 1/2 ton pickups, they are closer to the same width as the Mustang, but may also be grenaded. The only problem here is they came with drum brakes, so no ABS reluctor wheel. Not that you need it, but you can get the center diff outta each, use your new clutch pack, and slap it in the Mustang with new axles and make it work.
who knows what kinda shape the Exploder rear is in, it could be grenaded, and the axles destroyed for all you know. the axle is the inner race for the bearing, just like the Mustang 8.8.
The other thing I was gonna suggest is C clip elims. they should make the rear much more stable.