Rarest A-Body Option?

not sure if all of these were mentioned ( don't feel like trolling-through 12 pages right now ... ) , but here they are :

1. V1M Mod Top on a 1970 Duster

2. R26 AM / Cassette / Recorder / Microphone

3. R20 Radio-Ready Package ( consisted of speaker(s) , antenna , wiring , and a bezel-less dash ; everything except the receiver
itself ! )

4. Fast-Ratio manual steering ( 1965 - 1969 ) @ 16:1

5. 1967 GTS Dart Convertible

6. 1976 360 Dart Sport / Duster ( the 360 was relegated to option-status in 1976 ; wasn't a separate model vis-a-vis LM29L / VS29L )

7. Sunroof on a 1973-1976 "23" bodystyle ( more common on "29" bodies )

8. Clear windshield

9. Heater-delete with air conditioning ( typically export builds for tropical climates ; anomalies state-side )