I can confirm that King Wheels Matrix style rims in 19" will clear 6 piston Brembos on an FG. I test fitted a rim today and there is plenty of room.
For those interested here's a link.
http://www.kingwheels.com.au/index.p...product_id=133
I'll post a couple of pics once tyres are fitted to the rims and fitted to the car.