Does anyone even use radios anymore? Everybody I know uses their phone with blue tooth speakers.
Believe it or not Otto, not everyone is you. A lot of people want modern brakes, and modern gears, and functional radios.
Ferris: for speaker mounts, maybe take a look at Vintage Air. They sell kick panels with hvac vents and speaker mounts in them. Even if you don't like their setup/price, the image might give you some ideas.