Bassani Adapter Reduce 02 O2 Sensor Port Bungs 18MM To 12MM Fit For Harley Plug

NAMZ - NO2X-1202 - O2 Sensor Harness Extension - 18 mm to 12 mm

12mm to 18mm Oxygen O2 Sensor Reducer Adapter plug for Cars/Trucks/Motorcycles

Namz NO2X-1201 Replacement Part O2 Sensor Harness Extension and Bung Adapter

Harley Davidson Twin Cam Exhaust 18mm to 12mm Oxygen o2 Sensor Bung Adapters

Drag Specialties O2 Sensor Adapters - 18mm/12mm 1861-0594

Vance & Hines 16935 O2 02 Sensor Port Bung Plugs Kit 12mm

Drag Specialties O2 Bung 18mm To 12mm Converter 1861-1185