I was looking into the possibility that I could simplify the internal HDMI cabling in my box by finding a coupler that would bolt to the box in the same location as my panel-mount cable. I found a fair number of couplers that even seemed intended for panels but oddly I couldn't find any with the same hole spacing as my cable. The findings are so interesting though that I want to preserve the search results.
Here is a nice one, Ali Express though. https://www.aliexpress.com/item/Screw-lock-panel-Mount-HDMI-type-A-female-to-female-HDMI-extension-cable-Extender-adapter-connector/32617588109.html
Actually, Ali Express has a ton of panel mount couplers, including cool circular ones: https://www.aliexpress.com/cheap/cheap-hdmi-panel-mount-connector.html
Here's another one that would have been nice except wrong hole spacing plus it's another Chinese redistributor. http://www.showmecables.com/product/HDMI-Female-to-HDMI-Female-Panel-Mount-Adapter.aspx
Here's another panel mount cable, not terribly close in spec to the one I have but interesting: http://www.showmecables.com/product/HDMI-Panel-Mount-Extension-Cable-1-Meter.aspx
