NA Rear O2 Sesnor for 2003-2007 Subaru NA Oxygen (O2) Sensor Plug. 
 
Looking for the matching 2003-2007 NA O2 Sensor Receptacle? 
 
Housing Only = Plug Only
Connector Kit = Plug, Terminals, and Seals
Pigtail = Plug with Wire to Wire Connection, Terminals, and Seals
Pigtail with Crimps = Our Pigtail Option with a Butt Connector Crimp per Wire for Easy Install