That radio looks much wider than the knockout in my 544 dash. What's the center to center distance between the shafts?

Do you have any idea if / where / how a front speaker was originally mounted in a 544?
I can't recall seeing a factory set-up. Always figured they must have used a radio that had an integral speaker on the bottom of the radio chassis. I do have one of those (AM only) but it doesn't work very well. Maybe it's a 12V radio in my 6V car.
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"Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig