Pro Chaser Spark Plug Replace for Bosch WSR6F WSR5F 7547 WS5F WS6F WKA225T6 (Pack of 4) The package comes with 4 x Spark Plugs Good to know before placing order A minor difference in Spark Plug design may result in a different model. And feel free to contact us if you are not sure if this is the right model for you. Send us pictures of your current Spark Plug with clear shots on each side, we can help find a right match for you.