G I mine fits the same size as my Simpson did so I don't quite know how to answer your question regarding size. Maybe you should find a dealer who has them on the shelf where you can try them on. The neck area also seems fine to me. I mounted J&M headsets, not sure how Honda's are different. What I did was take the liner out & took a hole saw to the foam & made a recess for the ear pieces tucked all the wire in & put the liner back in. The liner is thin enough & loose enough material that the noise level wasn't that much different. Hope this helps.