FACTORY INSTALLED - it appears -

A single rear speaker was OPTIONAL on all non-convertible b-bodies from 1968-'70.
The factory installed speaker was different than the speaker included in the dealer/over-the-counter accessory "rear speaker PACKAGE".
It was available with any available radio (AM, AM hi-watt, AM/FM, AM-8/track stereo); it also could be ordered W/O a radio. (a radio was NOT required)
'68-'70 Plymouth b-body - the fader switch was mounted on the bottom of the dash frame.
'68-'70 Dodge b-body (W/O rallye cluster) - the fader switch was mounted in the switch panel to the right of the steering column.
'68 Dodge b-body w/rallye cluster - the fader switch was mounted in the radio bezel.
'69-'70 Dodge b-body w/rallye cluster - the fader switch was mounted on the bottom of the dash frame.

Any evidence to dispute the above?