I guess a similar thing happened to the Foxes that has happened to the CVRTs which came out in 2004. Some were bought by enthusiasts, others by dealers, but the majority of them went for scrap. Those which remain now command a high price.
When it comes to Fox bits, it's easier to say what's easy to find. Basically anything common with CVRT you can locate, so thats the engine block, starter, carb etc, periscopes and the odd fixtures and fittings. The fans, flywheel, exhaust, radiators etc are unique. While they were around in 2003/4, they aren't anymore. All the Fox projects are gone, so are the engine spares, and there will be no more. When it comes to wheel stations or gearbox you can forget it. The gearbox has some common parts to Ferret, but the vehicle weighs twice as much, which is why I think they are prone to failure. The brake calipers are common to Stalwart, so you can get the pads though!
Chris