There have been a couple of versions of this system, and the new parts fit the old tracks.
With the old style system connection the Standard Lever Lock brackets were pushed over the dovetail on the System Connector and the whole assembly was slotted over the Metal Bracket.
Here the System Connector is assembled and slotted onto the metal support bracket.
The new system only uses one plastic connector which incorporates the leverlock.
We now have a video which better demonstrates the new system, also the extension brackets and wall boxes for the system are again available.
TIP you can right mouse button click and zoom to full screen for a better view.