So here's the second new part:
http://rcinsider.com/ I'm surprised nobody noticed.
This is one of Brian's speed secrets. He's faster in the pits because they never strip and don't seem to load up much with dirt. And faster on the track because you can use a touch more torque on the bolt so they don't back out as easily.
X Factory UK has 'em now. They also have the individual sizes and the two drivers. Since the flat head and cap head use the same driver, most work requires just one tool. As Dirt would say, "Dialed!"