It looks like those may fit and work. My only concern is that nissan did not design the springs to be under the area where the struts are. I don't know if the z can handle the extra force from the springs.
That's a concern I read when I had the 350z as some people wanted the strut and springs to be combined. Even though nissan tested and designed the z to have the strut and spring separate for better handling.
Honestly, I don't think many coilover companies do as much R&D as nissan.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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