tr90 mount

I’m hoping one of you UK based sages can help me here.

I’ve just acquired a TR90 radio set for mounting in Hudson NZ2035. The unit hangs on a bulkhead in the aircraft in the aspect as it sits in the attached photo.

On each of the four sides of the case are four mounts, as you see in the pic, which I guess engage in some frame/bracket which then attaches to the bulkhead.

Has anyone out there got details of the appropriate unit (even better anyone got one)?

thanks in advance