GM LS1 Oxygen O2 Sensor Extension Cable Set of 2 for Camaro Firebird 24" Set includes (2) 24" Cable Extensions This is the Black Square 4-pin plug. It is different than the Gray Square 4-pin Uses the same GM Factory Delphi/Packard connectors, terminals and seals as the OEM wiring harness High Quality, Heat Resistant, Heavy Duty Construction Fits 1998-2002 LS1 Camaros and Firebird Trans-ams