DWCX 3pcs Motorcycle 90 Degree Non Resistor Spark Plug Cap Cover fit for 152 or 154 Gasoline Engine Dirt Bike ATV Quads|Motorbike Ingition| - AliExpress
NGK Resistor Caps | NGK
Small Water Proof Spark Plug Cap | Pedparts UK
PRO-0U Champion Spark Plug Caps - Non Risistor Type - British Motorcycle Parts Ltd - Auckland NZ