Recommended backspacing is ~135mm (7" ET45

Nissan 370Z rear suspension with with convenient camber adjustment and bumpsteer correction

To complite your suspension upgrade be sure to check out the Lock kit for Mazda RX8

You can tune your steering geometry either towards positive or negative Ackermann in just a few minutes even at trackside without messing up the alignment

But still maintaining required strength and stiffness

JR Wheels JR28 20x10 ET20-40 5H BLANK Hyper Black CB: 74,1 JR32 Recommended backspacing is ~135mm (7"PCD: 5x100, 5x105, 5x108, 5x110, 5x112, 5x114. 3, 5x115, 5x118, 5x120, 5x127, 5x130 ET: 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40