Has anyone used a wheel spacer to fill in the rear wells on a Duster?

There's your problem. THe new car wheels are all backspace and no front dish like the old cars and wheels are. Does your car have disc brakes by chance? If it does that will aggravate the issue because the front track is wider than the rear (of course) and wider than drum brake cars. Your car looks good with the Rallys I would order up a pair of 7 or 8" wides (15" if you wish) with a 4-4 1/3" backspace and rock and roll. That's what I did on both cars.

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Your cars look great! They have a great stance to them!

Yes, it has disc brakes up front. I like both the old school look and some newer style looks. This started off as an experiment as we found these 17” wheels for $80. Took some measurements, bought some tires, and bought some spacers. I like the look...