yes i agree it started in late 71 and 72 on.
i have a 71 duster flat and i had a 72 duster with the ridge.


65 Cuda 360,3.23 SG-13.97 @99.4, 88 D100, 2000 Kota Qcab, 71 Duster 416 11.84 @110., 73 Imp ,(2)72 & (1)71 Dart Swingers
GarysMocars Legendary Dealer