I'm interested in the suspension. It looks like they have a 5 bolt pattern (vs 4).
I have been wondering about that as well. Those are OZ wheels on the rally car. The OZ website shows two styles of wheels for the 124, and both are different from the wheels on the rally car. They also show it with a 5 bolt pattern so it's clearly a photoshop job.
The first image that shows up in google images for a "Fiat 124 with OZ wheels" is my own personal car, which doesn't even have OZ wheels. It has Evo Corse wheels, which are very similar and also a legit rally car wheel.
Regarding the suspension, based on the images I have seen, the attachment points, and maybe the arms look the same, but it appears to have different uprights, which accounts for the different spindles with a 5 bolt pattern. We have seen that before with Fiat group rally cars, so I think that's what's going on. It also has coil overs.
The original 124 Abarth had a different rear suspension: independent vs the solid axle.
Under the skin the Miata was amazingly similar to the original Fiat Abarth 124.
Here is the picture from the OZ site: It shows a 5 bolt pattern, so it's a photoshop job.
Greg