Dash Board
The main difference in the dash board is the lower corners. The early dash has rounded corners and the later dash with glove box has squared corners. The hole for the wiper and headlight switch bezel are larger on the later glove box models. Also the support brace behind the cluster was different on the '73-'77 models. The AC vent in the center of dash changed three times during the production run.

70-73 has round corners

Early 73-77 has squared corners
Also the support behind the cluster was changed

70-72 Support

73-77 Support
Dash Knobs

70-71 Dash Knobs

'72
Wiper/Washer Knob

'73-'77 Wiper/Washer Knob

73-77

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