WOW...that was quick...
The front diff housing on the VX is a 10 bolt ...the rear is a 12 bolt.
Obviously you'll still need to source a rear 12 bolt 4.77... to match gearing.
Make sure the ring has 43 teeth, pinion 9 ...43/9 = 4.77777777
Look for even wear on the teeth, this shows it was set up properly.
It may well be hard to find a single 12 bolt 4.77 rear...but even so,
you should grab this front one if its in good shape and a reasonable price.
You can then souce a front/rear pair of 4.77's...
...and you'll have a spare ( as already stated) for the front, which is very nice to have....
....and the one more prone to getting blown up.
Or....you may get lucky and find a lone 12 bolt 4.77 rear to go with it.
Jo
PS...
Worst case scenario is you end up with a lone front 4.77....
...that one of these days someone here will REALLY NEED!
(edited to correct 10 bolt front..12 bolt rear..My bad!)