With the proper sized 17", they will fit perfectly on the G35 coupe with Brembos. But, you'll need to remove the bolt/spacer combo on the front hubs to get the alternative wheels on. The spacer is there to prevent accidental swapping of stock wheels front to back.

 

Just to clarify, there's no spacer on the stock wheels, just a bolt to prevent swapping the rears to the fronts.