O2 Extension Harness GM 1) 12" Front Extension Harness (4-Pin)O2 Extension Harness GM 1) 12" Front Extension Harness (4 Pin). 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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O2 Extension Harness GM 1) 12" Front Extension Harness (4-Pin)