Hello Doug,
Ok. You need more? Here's more
Snell Foundation
Don't hurt yourself - there's everything you could ever want to know plus about 1K times more....
Look under SA (Special Applications) for automotive helmets.
My guess would be that SA 2000 and SA00 may be the same thing differently written because a quick look on the site only showed SA 2000. If it isn't, well, beware
Get a good one when you're done researching!
Tom