O2 Extension Harness GM LT1/LS1 1) 18" Extension Harness (4-pin) Flat ConnectorO2 Extension Harness GM LT1 LS1 1) 18" Extension Harness (4 pin) Flat Connector. Oxygen Sensor Extension harnesses are included in Header kits where needed. This part number should only be ordered as a replacment for damaged or lost Oxygen Sensor Extensions.
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