The rear size will fit but a few questions:
1) Why 10.5"? The size of the tire meant for a NSX rear (a 275/35/18 or 265/35/18) would fit a 9.5" or 10" (both of which will be lighter).
2) What are you going to do about the fronts? You'd need Rays to make a matching front set in 17x8..