Rarest A-Body Option?

Lots of good info here and some interesting votes. I didn't read every single post but one fairly rare option is a 1st gen Barracuda with a vinyl top. Others on the same car are: 7 1/4 sure grip, AM-FM radio, emergency flasher, and quick ratio manual steering. Rear defogger and disc brakes are not very common either on those early years. I think the rarest early A-body I saw was a '66 Valiant S.W. 273 Commando 4 speed with disc brakes, 8 3/4 S.G. and factory A/C. With those options it had to be a 1 of 1.
Thanks, Mark