This is a wider mounting plate for a Bigtreetech 5" hdmi display housing, originally from Grabcad. The original model is from here:
https://grabcad.com/library/btt-hdmi-5-gehause-1
To check for fitment there is a flat drilling guide in the model files. You can scale it flatter in the slicer.
I would be happy to see some of your makes posted :)
Source files in the Alibre Atom format is available but the website does not allow the upload. If you need it send me a message.
The author remixed this model.
I increased the mounting hole distance from 51mm to 67mm.