I know the view is (including my own) that the 17s look a bit too big, but one other option available to you are the Rota RKRs. These are Rotas' proper take on/copy of the Watanabe design (the RBs, RBRs, RBXs are an approximation and IMO look nowhere near as cool). There is more choice from the US in sizes and offsets for these - Rota in the UK are a bit lame in comparison with only a couple of sizes, albeit ones that suit standard Z arches, 15x8 and 15x9 et0. However, check eBay and you'll see sets with 17x8.5 and 17x9.5 with the required negative offsets to fill out the overfenders. Still think there are missing a trick by having these in 17" not 16" but here's a Z with them fitted: