Sizes of Thumb Wheel Radios

You're welcome. :)
The bezel pictured in your last post is the main instrument panel bezel. The instrument cluster fastens to the back of it, and then it is screwed to the dash. It just lays over the radio. The radio doesn't fasten to it. The bezel has the holes for access to the dial, pushbuttons, and thumb wheels.
My bezel isn't installed as I'm (still!) working in the dash. I posted the pictures so you can see how the radio mounts in the front. The back is supported by a brace to the dash frame. The brace is often missing from a radio, left in the dash when the radio is pulled. If yours is there, good. If not, you can look for one or make your own.
There's a thread a member posted a couple years ago in which he takes apart and rebuilds a '67 Rally dash. If I can find it, I'll post a link to it here. There are some differences, like the radio, but much of it is the same, and a lot can be learned from it.