Rarest A-Body Option?

Convertible

3729 built in `67 not sure of the other years

AC is not rare in the newer A Bodies, probably about the same % as other body lines that are not luxury models

depending on location shipped to if rear window blower/defogger would be installed/ordered, same now.

Have seen folding canvas top on mid 70's duster/ dart sport body style and crank in a 74 just last friday

Never seen rear shoulder mounts