For the bottom ones I used an expander plug bought at the hardware store and burned it through with a hot 5/16 drill bit. The top ones I had in my boxes of rubber goodies from a Kawasaki restoration, they fit just fine. You should be able to also rig something up with those from the hardware store, they don't have to be perfect, just rubber mounting the headlight. Oh, and when I say a hardware store I don't mean Home Depot. I mean a REAL hardware store.