Ok so looks I may go 10 all around. I re did my math and modeled in solid works to re affirm that the distance wheel center to hub flange is 7mm and the inside rim to rim is = on Nismo vs Sport (actaually Nismo is like almost 1mm wider but close enough) so the center to center is 14 mm wider on the Nismo and the extra 1/2 inch is all to the outside on the Nismo.
Again this wasn't a what fits post I know people can fit all the way to 20 non lowered and I think 15 lowered but I was more worried about the effects of increasing the + scrub radius that much. So with 5mm I'll still be 2mm less than a Nismo (factory known good) and make sure I'll have no instability under braking or steering wheel kickback and with 10 I am just 3mm more scrub radius than a Nismo so that should be pretty minor, I think people with Miatas don't feel the negative effects of too much scrub radius until about 10mm over stock.
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