Radio opening and knob spacing

[CALGMC]

Does anyone know the original factory din opening and knob spacing for a 1964 GMC pickup?

[AZKen]

Can I ask why you need that? It's not DIN. But I know what you mean.

There are patch panels to repair that area.

[CALGMC]

maybe i used the wrong word. What is the size of the radio opening of a 1964 - 66 GMC pickup. Also, need to know the knob spacing. I purchased a project that the previous owner repaired the radio opening. He left an opening of 1.5 x 3.5 with know spacing of 5-1/4". I purchased a stockGMC radio, but the radio appears to be 1.5 x 4.5 with a knob spacing of 6-1/4. I'm curious what the size is for the 60-63 trucks as well.

[CALGMC]

here is my opening, knobs appear to be drilled at 5", I believe stock radios for 64-66 are 6-1/4. What is the correct opening size for 60-63 GMC trucks?