2007GT/CS

While I was helping a buddy buy a new GT today (obsession loves company I guess) I asked the dealer about the weight on the Roush wheels. They didn't have a clue, tried to look it up online (and failed), and then posted the question to their Roush rep and got no response.

Two questions:

1. Anyone know what these things weigh?
2. How is it that Roush manages to get an 18x10 on the front when no one else can? Seems like a number of wheel manufacturers struggle with 9.5 and some even 9.0.

Thanks!