Like the #4, the bolt heads for the #7 came in 0,1,2,3,4 & 5. Do you already have a stripped .22 bolt head and just need the extractor, spring and screw? I do not know the approximate lengths of the .22 bolt heads but if you already have a properly registered .22 barrel in the action you might be able to use various stripped #4 bolt heads and fired .22 cases to get some idea of which of the #7 bolt heads you need. Then its a WTB in Milsurp bits & pieces on the EE. Please PM me re possible sources.