ICT Billet WE0XY31-24 Features:

LS O2 Sensor Square 4-Wire 1-Keyway Wire Harness 24 in. Extension

Sealed, crimped and assembled in Wichita Kansas, with USA made, OEM grade, TXL wire

• Every assembly is individually hand-tested to ensure it exceeds OEM standards
  
• Compatible with GM LS series engines with Square 4-Wire 1-Keyway style connectors (see photos)
• Includes: 1pc wire extension harness
• Assembled with OEM tooling, OEM Delphi (connector, lock, seals, and terminals),(uses OEM harness wire colors)

Don't take a chance with cheap wire connectors, that use poor quality (wire, crimps, twisted/bent/unseated terminals) and have conductivity issues that will cause your engine to run poorly and be difficult to diagnose.