Well that’s new to me
Today I learned not all first gen radios are identical
The notch on the front to allow the dial face removal is definitely not there on the few units I have like in my photos
Neat

The bottom spacers for mounting can be purchased as reproductions, but those are the easy ones to make
I’m not near them now to measure but if I recall they are about 1/2 thick, you could start at 1/2 and add washers until you like the fit
Then make a new one that is the length you desire

https://www.chevsofthe40s.com/detai...nt_Of_Radio_To_Dash_Upper_and_Lower.html

You can also buy reproduction knobs
-s