Peculiar, here in the UK you cannot buy a Mirage without alloy wheels, in fact most cars here have alloys. There are older base model Mirage's from 2013 that had wheel caps but never seen one on the road. Very rarely see any Mirage for that matter.
I cannot think of a manufacturer that sells a car with wheel caps apart from Fiat.
However, in the past I had used cable ties to keep hub caps on the car. Now I just use cable ties to keep my Mirage together because of potholes. We're privileged here, we pay an annual road tax for the pleasure of smashing our cars to ruination because of potholes.