many, many years ago, I read in a MOPAR Magazine the FM3 production was less than 1% of total production....that was as close as it could be pinned down...I owned 4 FM3 T/A Challengers thru the years and went to buy a FM3 AAR CUDA, but the car was not what it was cracked up to be, so I passed...there is a 70 Pink Road Runner a few miles from my house, and there used to be a 70 FM3 Duster, but it sold a few years ago...
I always liked the pink, it got more attention at car shows than any MOPARS I ever owned except winged cars....