I've got a friend with an '87 Trooper who is looking to replace his auto hubs with some manuals. The parts store is asking him what the spline count is, but AllData is only showing me one factory part number for each side for replacement auto hubs, so there can't be much for options there. Anybody out there know where I need to look for manual hubs for this thing without having to tear them down and explain it to the kid at AutoZone?