I, personally, go to Discount Tires (aka America's Tires) in part because the manager of the local store is willing to have his workers try different wheel and tire combinations until we come up with what I want and what will work.
They have access to most every wheel, including Tire Rack wheels.
If you are pushing the limits, and your last post indicates you are, find a local tire dealer who is willing to work with you. If you insist on using mail order and get something that does not fit, I will laugh out loud. I know that is not nice of me, but there it is. I feel no obligation to be nice.
Fitting the tallest and the widest is an art. There is a reason Tire Rack took the least controversial way out. If they send you something that does not work, clearly someone has to pay the piper.
Get thee to a local tire retailer you feel you might trust.
Laborsmith
And you are clearly willing to not get the biggest and widest if you are insisting on OEM wheels. You need to go to at least an 18X8 to accomplish what you want. - Laborsmith