There's a couple issues going on dimensionally.
Calipers (and the pad shapes that they accept) are designed to fit particular disc dimensions...based on overall diameter, annulus (swept area), and thickness. Most OEM applications use a wide annulus design in order to maximize longevity and reduce NHV's (noise, harshness, vibrations).
For the front kit, we got lucky in having an appropriate caliper (with the proper piston diameters) and pad shape (with the proper radius, thickness and annulus) to be able to offer the caliper upgrade as a solution. The rear issue is based on not having a disc/pad combination that matches appropriately.
For the few of you doing this as an aesthetic upgrade, unfortunately you will be stuck with the OEM rear caliper. For those who are seeking a performance solution, the front caliper upgrade makes a great performance improvement on it's own, and can easily be matched with a rear pad/braided lines/brake fluid upgrade. The rear discs do not see the temperature related issues that the fronts are prone to under aggressive use. Dollar for dollar, this solution is the best bang for the buck on the 370Z.
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I work for Race Technologies, Brembo's sole distributor and representative in the US. I am here as an enthusiast, the opinions shared here are solely mine, & not necessarily shared by that of Race Technologies or Brembo.
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