Did the Duster ever come with a center console /w 4 speed?

I'd like to say the '70 Dusters could be had with them, but I can't recall seeing one... but I have seen '70 Swingers with them. Can't swear they were factory, though.
Just use the '69 and up 4 speed top plate on your console, it has the woodgrain. '68/67/66 used chrome/satin top plates.
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The Tremec has the shifter centrally located on the trans hump, so you shouldn't need to add the 4 speed hump (although some tunnel mods may still be needed). A little tweeking on the console bracket locations fore and aft should be all you'll need to center the console opening on the new shifter. All depends on which Tremec you use.