(2) spindle seals
(4) trunnion bearings & outer races
small pattern shim kit (assuming you plan to center your birfs in the knuckles)
lockout outer hub gasket
spindle nut locking/star washer
you may be able to get away without this stuff, just depends on how deep you intend to go and what is required. I say go all the way while it's apart but some may have the 'if it ain't broke, don' fix it' attitude.
open up the bag in the lower left of your pic. looks like outer spindle dust wipers
Buy the complete kit from Marlin Crawler and get everything you need (except trunnion & wheel bearings avail separately/other kit) including his HD inner axle seals for $39. Your 81 FJ will use the same parts as a FJ60 or minitruck.