1970 Challenger AM/FM radio, 3 speaker dash

Hello Everyone, I'm new to the forum and relatively new to owning a 1970 Challenger. I have a few questions and I'd appreciate your help. My car has the R35 option, AM/FM Multiplex Stereo. It has the 3 speaker dash. Does the R35 option include the 3 speaker dash? The original radio is missing and was replaced with a more modern radio/stereo. Above the radio and slightly to the left is a round knurled knob that says speaker, the knob can be rotated to the left and right. Does that speaker...

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Author: Schnooks70