This is the Camshaft Position Sensor found on the Driver side (Bank 2) of the VQ35DE engines in all 2003 - 2005 Nissan 350Z and Infiniti G35 models. 2006 (Rev Up) Models use two of these sensors, one on each side of the engine (driver intake & passenger exhaust).
Models equipped with the VQ35HR (Dual Throttle Body) engine use sensors found HERE.
This sensor may differ slightly from the part installed on your car currently. The provided camshaft sensor is a current revision by Nissan.