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Napa has several size spark plug inserts at $8.99 for two. Link below. Dave
https://www.napaonline.com/en/search?q=Nty%3D1%26N%3D2500001%2B2600108%2B2803910%26Score%3D0.9&referer=plp&partTypeName=Spark%20Plug%20Inserts&keywordInput=spark%20plug%20inserts&scene=partTypesScene3&fullyQualified=false