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Once you have tires on and the suspension is loaded, we will have a much better gauge and this depends on your camber too. Although I'm inclined to think 18x11 et 56 will require possibly a spacer.
I am picking up my Polar Silver C4S tomorrow, and I have the same size and offset wheels (18x8.5 and 18x11 ET56). Mine are reverse mounted (all four wheels) and no spacers were required.
I can put up a couple more photos when I have my car back but here are a couple from the shop.
I'm pretty sure it should fit, on the rears the clearance problem usually isn't inboard. It probably won't look bad either, just wheel arches not filled out optimally. Mainly a cosmetic thing and rarely a mechanical problem unless the offsets are really off causing stress on components.