Looks like Jay and I did the same thing over the weekend. Tires are Essenza 210 Type R in 235/45-18 size (made by Goodyear). Perfect fit! No rubbing, and not too much gap for those giant Cutlass wheel wells. A tiny bit smaller overall diameter than the 225/60-16's that were on it before.
More pics here: http://www.cardomain.com/id/gnatgosplat2