When you say swivel bearing and seal kits, are you talking about kingpin bearings, or the big wheel bearings and seals ( for the hubs in the swivel ball of the diff.... not sure how else to describe it )?
The kingpin bearings can be sourced easily from Bearing Man. If I recall there are no seals for the kingpin bearings. If its the wheel bearings, they can also be scoured, but the one bearing has a radius on that either needs to be machined on the outer race of the bearing, otherwise it will not seat properly in the hub. I think Peter Connan has the wheel bearing P/N's if I'm not mistaken
check these outviewtopic.php?f=45&t=2994&hilit=wheel+bearing+part+numberviewtopic.php?f=43&t=4121&hilit=wheel+bearing+part+numberviewtopic.php?f=47&t=2927&p=30639&hilit=wheel+bearing+part+number#p30614viewtopic.php?f=45&t=1859&hilit=wheel+bearing+part+number
Stabilizer connecting rods.... or Swaybar links are agents only but if you have a load of them that need replacement, I would suggest making them up yourself, dead easy and will cost you a fraction of the price. Ball joints can be bought from guys like Bearing Man, fitted onto round bar cut at the same length with same fitting as where it fits to the chassis. I've been meaning to make myself a set for my Patrol for ages now.... just never gotten around to it.
Those spring bumpers....hmmm.... i think agents only
Stabilizer rubbers.... not sure