Vance & Hines, 18mm O2 sensor plug set. zinc.

Zinc-plated steel. Fits 18 mm x 1.50 sensor bungs. Required for 1986 and newer H-D models equipped with non-O2 (oxygen) sensors and an exhaust system with stock threaded sensor plug holes. Can also be used on H-D models when O2 sensors are no longer required.

Fits: > 1986–2006 H-D (with exhaust system equipped with O2 sensor bungs)

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