Bell Helmets makes a Custom 500 that is DOT and ECE, which is equal to SNELL, and I think all racing sanctions reconize as equal to SNELL, ECE is a world wide tests, SNELL is only USA.
You may have to special order the Bells at a motorcycle shop, or of course check on-line, but on-line ordering is tricky getting the right size. Most people order helmets that are too big, they should be on the tight side because the inner liner will compress after you try them on after about 10-12 times. A too loose helmet will not give you the protection you want when buying a safty helmet. When I was selling M/C hemets I suggested trying on a smaller & smaller helmet until it hurts then go back one size, they ALL loosen up after the inner liner compresses to all the bumps in your head.