Replacement for Nu-Tone st-1000

Good Morning! My house has a NuTone st-1000 in it and one of the knobs has broken. I first set out to find a replacement knob, but have since decided I would like to find another model with possibly a cd player (mine has a cassette player) that will fit in the same hole in the wall' I am not interested in an intercom. Can anyone guide me? Thanks!

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