You should be able to get bearings, races & seals at most local parts stores...when I did mine I found some scorching on one bearing.
A quick trip to the local NAPA & I was back in business.
Also, from a few things I've read, a digital scale (with a hook, like for weighing fish) is the hot ticket for adjusting the bearing tension.
There is a good how-to write up on this subject on either planet isuzu or the 4x4 wire...can't remember where I saw it.