| Thumb nut set for early original spark plug, set of 4Additional Information Set of 4 brass thumb nuts. These nuts fit only the early ORIGINAL Champion X spark plugs. The 5/40" Thread on the top stud is noticeably thinner than the later style original or reproduction plugs. Questions and Answers There are currently no questions for this item. To ask a question about this item please press and fill out the form. | |