While I'm not familiar with GReddy's spark plug lineup, I have a bit of info that might help you out.
Our OEM plugs are heat range 8, and considering it's a Nissan I'm going to assume JIS standards. That leads me to believe either one of these would work :
Spark Plug JIS 8 Iridium Tune 13000068
Spark Plug JIS 8 Pro Iridium 13000108
Spark Plug JIS 8 Pro Platinum 13000118
This is just speculation, I haven't seen anybody run GReddy plugs. Most people tend to replace with the same OEM plugs, or they go for the OEM GT-R spark plug swap.
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2011 370z Supercharged Sport Touring 7AT
Stillen: Supercharger Kit | Cat Back/TP | Oil/AT Coolers
GTM: Hardened 7AT (valve body+torque converter)
Whiteline: 27mm Front | 24mm Rear | Swift Springs
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