Check your fitment before you consider getting them rolled, mine's lowered 30mm with 19x10.5 Rears Et 21 and 19 x 8.5 Fronts Et 40, the fronts have 20mm spacers, the rears being wider don't need them, but with the Rays I run 20mm spacers all round with no scrubbing.
If you get your arches rolled check them for dirt and water regularly as it sits in the roll and eventually rots them away, a lot of places cut them rather than rolling now because of this (gives a much smoother finish too).