Hello from down east...New Brunswick.
I have a 76 Dart Sport, when they stopped the Demon name in 72 it was replaced with the Dart Sport name from 73-76 but they are all essentially Dusters with different grills and tail panel.
Getting back to your console problem, you have 4 options:
1-finding an original or some thing in that manner would be expensive and most of the time only available from the U.S.
2-building a custom console is not cheap and usually a headache.
3- measure how much room you have width wise and buy a used one in a junk yard. This way you can get cup holders which come in handy and maybe even 1 or 2 more output jacks.
4- You could just run a hole in the floor with a boot for your shifter.
I started with a boot and shifter, then managed to get a Mopar console from the U.S., then I thought I might try my hand at a custom console with cup holders but thought heck a used one the proper width would be less trouble, save headaches unless your a carpenter and be much cheaper, so I have a console from a 2010 Kia Forte. My daily driver is a 2013 Kia Forte and after doing some measuring, I found that it would fit. So now I have my cup holders, 2 more plugs, a place to put my box of Kleenex and an arm rest. Usually a console from almost any smallish car will work, measuring for the proper size is the key. All I really did to the console was extend the back about 3 inches.
View attachment 1715009354
to the fray. What norton said - post a wanted ad - you'll find what you need! Keep us updated on your progress too!! 
