Thought I would post this in here as well. This info is for the '86-'89 boxes:
From talking to my dealer friend, Toyota offers two kits for this box. The first kit is a partial kit and only covers the sector shaft seals. The part # for the partial kit is 04455-35020(~$50). The part number for the full kit which has all of the seals for the whole box including the input shaft seals and everything is 04445-35080(~$100).
Hoarder of Land Cruisers, wheeler of none.