Nopi.com lists 2 kyb gr-2 struts for the rear.

GR-2 Gas Shock, Left or Right Rear, 2WD Models $43.62

GR-2 Gas Shock, Left or Right Rear, All Models $50.44

Which one does a 2gnt need?

I got banned for being a constant tard.

I got them from Tirerack and I remember ordering the ones for the 2WD model, becuase I have read that the GSX and spyder models have different shocks in the rear I think. Anyway, I'd go with the 2WD ones just to be on the safe side. Good luck and hopes this helps