I made a support to put the Rock Pi 4 inside a PC, who wants can modify the will. I do not have a 3D printer and I had trouble finding a person who printed with high resolution, the result was unsatisfactory.
I also had difficulty finding 4 size-appropriate screws for the bracket, which comes with the heatsink is small, so I do not have photos of it inside the PC missing the screws.
Link:
https://www.thingiverse.com/thing:3648721