I'm re-installing my re-furbished stock radio, but the way the factory mounted it has eluded me. I believe the radio goes in before the HVAC bezel, levers and cables, but I don't see how the radio is secured in place. There are threaded holes on each side of the radio but no bracket of any kind to support the radio. Am I missing something? 

I am in the process of cobbling parts together to mount a AM/FM Hitachi KM-1520 in my 73. You need a bracket that mounts to radio on each side and then mounting brackets to install in car see attached pictures.

Here's a good thread I used when I did mine.

 

Well, I don't have anything that looks like that. Looks like I need to fabricate something. Thanks for posting this.