HERE IS A BUSHING TO REDUCE YOUR 3/8" GLOW OR SPARK PLUG TO USE 1/4" GLOW OR SPARK PLUGS-----ALL NEW PLUGS MUST BE FULL LENGTH----COMES NEW WITH A NEW GASKET-----ENGINES WILL RUN ON EASY TO FIND PLUGS AND RUN JUST AS WELL----CONVERT YOUR OLD SPARKIE TO GLOW IN MINUTES OR GLOW TO SPARK----BRAND NEW AMERICAN MADE