This bracket is designed such that your radio can be mounted with a universal ballhead mount for cameras using 1/4" screws (I used this one here: https://www.amazon.com/dp/B0BMPQBXK4).
It's a tight fit for the 1/4" screw, so applying some heat to the print may help for your initial install.
Photo shows the back of the Yasesu FTM-500D radio with the rosetta mount which this bracket fits into.
Yaesu_Rosetta_Mounting_Bracket.stl | 3.3MB |