I no longer need a light to hang from a ceiling lighting rose, but wanted to have the wiring still available for future use.

My lighting brackets appear to all be threaded for 3" BSP. (weird but a lot of these designs date back to when steel pipes were used as conduits , hence BSP), so this stl file is for 3" BSP.

Note make sure those unused wires are all screwed tight in their terminals, you don't want a hot copper terminal near a thermoplastic printed part.