the wheels only came in 18 x 8 . thats fine for the front, but the rear needs more, I found a company here in Stockton that widen them by another 2 inches, then found some short studds for the rim to bolt up! if I remember right the bolt patterns are 108 x 5 I think, not many wheel companies make that size... I think when I was done I had around $3000 in the complete project. rims and tire
If I'm not mistaken, the 348GTC runs on 18" similar to Chiaro Slag's wheels and the Japan only Special Edition 512TR.