Spark Plug Cap – 5K or 0K resistance for 14mm spark plug, with 90 degree Elbow (RD/RZ/R5), NGK Type – Reproduction, sold each. These caps are just right for the RDs and other 2 stroke vintage Japanese twins. Includes waterproof covers. For terminal stud type plugs or plugs with removeable terminal nuts (BR8ES, BR8HS). It is not recommended to use both resistor caps and resistor plugs, use either resistor plugs with non-resistor caps, or non resistor plugs with resistor caps.