UHF radio mount thing.

thingiverse

This mount enables attachment of your radio using its belt clip onto a 25mm tube, offering both straight and 45-degree options as STL files. Channels for zip-ties are included in the design. An updated version, radio-mount-bfeng.stl, added in April 2015, features a hole suitable for DIN-6 sockets with DIN-8 compatibility. Flower nuts for DIN mounting screws are also incorporated; however, ensure you use the smaller M3 flower nuts (around 4mm wide) as larger ones won't fit. Installing the nuts and securing them with M3 screws can be challenging, but using curved forceps should help. Lastly, a cable tie on your radio's cable will prevent it from being pulled too far and damaging the DIN wiring.