O2 Oxygen Sensor Header Extension Wire Fits LS1 LS2 04-06 GTO CTS-V 12" 2- 12" Grey Square Connector O2 Sensor Extensions Product details: QTY 2 extensions They will work on many GM application besides those listed. Look carefully at the connector pictures to verify they are what you need. Fitment information: 08-09 G8 GT V8 2004 LS1/LS6 Corvette (front sensors) 04-06 LS1/LS2 GTO (front sensors) 04-05 LS6 CTS-V (front sensors)