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 knob control a speaker/ speakers in the package tray area in the back? The package tray now has 2 modern 6X9 speakers in it with the plastic grills above and on top of the package tray, so I don't know the original configuration. Or is the speaker knob for the front 3 speakers? If there was a speaker(s) for the back, would that have been a part of the R35 option also? Your help would be greatly appreciated.