This is what I know about it......I have a '70 Duster 340 4 speed. The dealer brochure shows a black knob with white letters for the standard 3 speed. The 4 speed was optional for the Duster 340. My car had a pistol grip in it when I got it. It was put in by previous owner around 1973. The previous owner told me it had the black knob when he bought it. I have removed the pistol grip and returned to the black knob shifter.
