67 notch pieces

There wasn't a cassette player available back then. The 2 little windows for radio dial and buttons do suggest a cassette tape would fit through but... I don't know of a head unit that would toss right in without mods.
Without going into all the differences... If you'll use the 67 only climate controller, and the 67 bezel, be sure to get the correct 67 only pot metal inst' housing.