How to use the Apple system AudioUnits?

OSX ships with some basic but useful AU plugins but they are not in /Library/Audio/Plug-Ins/Components or ~/Library/Audio/Plug-Ins/Components like all the other AU plugins. Does anyone know where to find them and how to use them in the Juce Audio plugin host like any other AU plugin?

Here is a list of system AU plugins:

No problem using Apple Plugins in Juce Audio plugin host. Scan the Plugins and you see all in the list.