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I have a GoPro Hero2 HD Outdoors edition. New, in box, never opened.
To convert this to the Motorsports edition, you just need the suction cup mount and/or the J-Hook Buckle.
The suction cup sticks it onto the outer panel of the car. The J-Hook buckle, I feel is optional, it's a hard mount to your helmet. but the Outdoors edition has 2 softer head-mounts which also can strap to your helmet.
Check out the Outdoors kit: http://gopro.com/cameras/hd-hero2-outdoor-edition/
I'm in Arlington.