I got this info off of the Snell web site.
What are the differences between the SA, M and K standards?
The SA standard was designed for competitive auto racing while M standard was for motorcycling and other motorsports. The K standard was released to accommodate helmets used in karting. There are three major differences between them:
The SA standard requires flammability test while the M and K standards do not.
The SA and K standards allow for a narrower visual field than M standard (Some SA and K certified helmets may not be street legal).
The SA and K standards include a rollbar multi impact test while M standard does not.
Looks like you need an M2005 rated helmet.
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