Try this - take out your air cleaner and remove one of the nuts that holds it to the bubber isolator - I think they are the same size. Try it on your stud to be sure, if OK go buy some at the hardware store. Any hardware store that has the loose boxed machine screws will have metric nuts as well. The above poster is correct - the 10mm is the size of the nut across flats, not the stud size - it is probably actually a 6mm.