Where to buy an open back pattress box with CLIPS

[TomHD]

Hey peeps, we're installing some new gear into a fresh built classroom. We have trunking all around the room and we are now looking for an open back pattress box to mount a volume adapter and VGA etc, but are having trouble to find any box online that has the clips that we want to clip the box into the big trunking we have.

 

Please see picture below with the clips that we need highlighted.

Thanks in advance

[Chris_]

The boxes are usually specific to the brand of trunking you use. Check what make the trunking is then try and find the appropriate boxes.