I swear I saw this on here but I can not find it now. Will the miata alloys from a 1st gen fit onto the new mirage without clearance issues or sticking out real far? I think they are 14x6 with a 45mm offset. I think 4x100, no clue about center bore.
They are the same bolt pattern. Hub bore really isn't an issue as these cars are lug centric and lug piloted (tapered lug nuts center and pilot the wheels). The only vehicles that are really dependent on the hub bore is 3/4 and 1 ton trucks.
However, hub bore may be an issue if the Miata wheels have a smaller hub bore. In which case you'd just have to make them a bit larger with a file or something. Not recommended to drive a wheel with a smaller hub bore on with an air gun ... because it takes many sledge hammers to remove.