If you are talking about the set that srcada is selling, they are actually 18 x 9 which helps. 9.5 in front would have been somewhat problematic. +31 offset is pretty aggressive for the fronts and you may need to do some fender modding. Since you are completely stock and not lowered, you might be OK (until you lower it).
The rear will probably be OK but I can't guarantee the front. srcada has had that set for sale for awhile. If it was not for the fact that I've decided to go larger than 18s, it is not the R series, and the iffy fronts, I would have bought this too. He says that the wheels came from a GS so maybe you can find out who the previous owner is and contact that person to see if there were any issues.