biglady---nhra requires for a car running between 13.99 to 10.00 open or full helmet---m2000, m2005, m2010, k2005, sa2000, sa2005, sfi 31.1a, 31.1/2005, 31.2a, 41.1/205or 41.2a, with or without a shield------scta requires an m for motorcycles and a sa for cars and motorcycle streamliners and motorcycle sidecar streamliners--full helmet with shield---for the 2010 race season you will need a sa 2000 ,sa2005 or sa 2010 if you can find one before november --for the 2011 race season the sa2000 will be no good willie buchta