Radio installation help!

You didn't say what vehicle. Most of these older Chryslers have a odd ball dash and bezel. Two little rectangle windows for radio dial and buttons. Most common low dollar solution was butcher the dash and bezel for a D.I.N. standard unit.
I have a D.I.N. head unit in my rally dash but not in the common low dollar manner.

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Sorry I should have said, I have a 1974 Plymouth Duster! And I’m not worried about having am/fm just aux and Bluetooth mainly!