radio interchange question

Just trivia... The 1968 model got the lower dash pads. It wasn't going to be easy to get a hand there and turn knobs with pad in the way. This is what brought about the dumb wheel radio design. Although the lower pad disappeared after one year model the dumb wheel radio didn't disappear at the same time.
They also rotated wiper switch orientation 90 degrees in 1968. I think that too was due to the lower pad conflict.