There are very few tires that fit the 17″ wheels that Factory Five sells; one of the few are Toyo Proxes R888. We decided on these awhile ago, but I wanted to order them now because we need to get the wheels on the car with the chassis at ride height in order to measure for the shocks we’re ordering.
When I tried to order the tires, almost every place was out of stock (at least for the front tires). TireRack.com showed only one of them in stock, but a quick chat with one of their salesmen showed they actually had two in stock. It turns out that Toyo just discontinued the R888s and I purchased the very last two 255/40ZR17 they had in stock. They only had a handful of the 315/35ZR17 (rear) tires as well.