Definitely are available in 5x100... They've just linked photos of a 4 stud wheel.
I agree that white wheels would be a massive pain, and I personally would never get a set, but I maintain that the CR KAI/Torques above look sensational in white on the red WRX...
I reckon the GForce in Hyper black looks pretty good against the red... albeit the Evo red, but you get the idea!