Single Brass Vintage Spark Plug Adaptor 18mm to 14mm

High Quality NGK 18mm Spark Plug with 12mm reach

High Quality Champion 14mm Spark Plug with 11.2mm reach.

Lodge 18mm Spark Plug Model C3, detachable short-reach.

High Quality Champion 18mm Spark Plug with 10.9mm reach and tapered seat.

As Champion D16-NGK AB6, 18mm Gasket seat, AccuSpark triple G spark plug AA77C

High Quality Champion 18mm Spark Plug with 12.7mm reach.

Vintage Champion R7 Racing Spark Plug Classic Sports Car 18mm