4pcs Upstream & Downstream Fits 1998 Ford Explorer 5.0L 02 Oxygen O2 Sensor

4pcs Upstream+Downstream for 1997-1998 Ford Explorer 4.0L Oxygen Sensor O2 02

2pcs Upstream&Downstream for 1999-2001 Ford Explorer 5.0L o2 02 Oxygen Sensor

4pcs Oxygen O2 02 Sensor for 2004-2010 Ford Explorer 4.0L Upstream + Downstream

4pcs Upstream & Downstream Fits 1998 Ford Explorer 5.0L 02 Oxygen O2 Sensor

O2 Oxygen 02 Sensor for 2004-10 Ford Explorer 4.0L 4.6L Upstream Downstream 4pcs