You need the c-clip eliminators at 11.99 (NHRA), along with a 5 or 6 point rollbar, fire jacket (but not pants), and 5 point seat belt harness. You need a helmet (Snell 2000, I think, but maybe Snell 95's are still okay) at 12.99 (again, all this is NHRA, not for convertibles, and in NJ everyone needs a helmet), and if you run sticky tires you need a driveshaft loop and they may require open-ended lugnuts so they can easily see that you have all your studs and they are long enough.