I went with the 230mm springs in the rear. It was recommended to me by the vendor. If you plan on dumping your car go with 210 otherwise go with 230 the 210 has been known to be to short and If the car isn't lowered more then an inch in the rear the spring will pop in and out when the suspension fully extends. With the 230 spring you can dump or keep it under an inch.
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2010 Solid Red Z: Mods: Stillen G3 Intakes | BC Coilovers | H&R 20/25 Spacers | Stillen Splitter | Stillen LW Pullie TBI | Red GTR Start | LED Interior | Kenwood Double Din 
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