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.

I removed my hump and used a drivers side auto floor pan to patch it. I had a Hurst Kit no longer made and they included a rolled cover to span the opening. Almost all kits are designed for an auto. My stock drive shaft was the correct length, I just used a conversion joint on the front. The majority of the work is reworking the tunnel. I did learn the cast aluminum SBM to Tremec uses the 72-up Z bar pivot bracket and the stock throw out arm boot prevents the arm from fully moving. Like the opening is too small, although the boot fit.

FYI I used the 68 down non wood grain covers. I hate fake wood grain stuff.