2016 Mustang rims? For 74 Duster

There's a few issues. The tires are 27" tall, so, right off you can't use the tires on the front, they're too tall and won't fit. And that's pretty expensive, especially if you can't use the tires for the front.

As for the rims, I think they'd look fine. The backspace in the front would probably work fine, most of the OE mustang rims work in the front. Although, most of them also need the hub bores opened up a little bit too. In the back if you have an A-body rear axle you'd need a spacer/adaptor on the order of 1" or maybe even 1.5" depending on what axle you have. Not ideal but not insurmountable.

I'd skip that particular set myself, but not because of how they look.