I just got done doing a lot of work looking over availible tire sizes for 18 and 19" wheels in sizes exceeding 245 on front and 275 on rear. To get an optimal set of tires to match the factory diameters is a little bit or work. Anyways, I typed up a sheet listing optimal combinations and tire manufactures that produce those tires. I can attach an e-mail to you in word if you think it would help you.

Jeff