Mx-5 Titanium and SP turbo have the right size disks for 4-stud (276mm). You can also use the factory Mx-5 bracket to re-mount your caliper this is what Rupewrecht and Aaron used for their rears and it should all fit perfectly.
The Mazda 6 disk (280mm) is only because we have 5-stud and I'm not using the Mazda bracket because you need to have the diameter of the Mazda 6 disk reduced slightly to fit correctly.
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