2X LS1 LS2 LS6 Oxygen O2 Sensor Extension Cables for GM GTO CTS-V Corvette 24" Set includes (2) 24" Cable Extensions This is the Gray Square 4-pin plug. This is different than the Black Square 4-pin plug Uses the same GM Factory Delphi/Packard connectors, terminals and seals as the OEM wiring harness High Quality, Heavy Duty Construction Heat Resistant, Automotive Grade Materials