I've just bought a new Arai lid and lovely it is too. I may well have been wearing the wrong size for years, as this one's a medium rather than my usual large and it feels juuuuust right. Anyway, helmet size is a medium, but the pin lock visor insert thing that came with it is marked Arai "L". Anyone happen to know if these things are sized, or are they a universal fit? Or more likely, Arai M and L lids use the same visor?