Are you on the gold coast or brisbane?
Ill fix it for you...
i really highly doubt you will have to roll the fronts man, unless your in negative offsets.
im about to go
20x10.5 - 3 (F)
20x12-3 ®
if i can fit that under standard guards, you should have no drama
id say invest in some camber arms (my coil-overs don't even have camber tops)
unless you want to run your wheels flat/upright then you would need wide guards, but i personally hate most widebody g35's
Flared is the most id go.