94camm

hey, i am gong to get a set of the C5 corvette thin spoke corvette rims. 17x8.5 fronts, 18x9.5 back. I've read some of the threads and people say to put 275/35/18 on the back. I also read that people are having problems with there rims being "tucked in" and need spacers. I really want a wide tire that sticks out a little on the back and didn't know if i need spacers for the fronts also. If anybody can help me what size of tire, spacers or no spacers, that would really help me out and pics if anybody has this size of rim/tire. Thanks!