try ogracing.com ... and get a decent one - if you have decent head - me I have a gorgeous face and an incredible brain so I opted for a SA 2000 helmet with face protection. I can't stand to hear beautiful women cry.
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"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower"
-Mark Donohue