Dave, I don't doubt what you say about being able to stuff (6 + 3) 9" wide rims under the Saab. Maybe 11", but I don't thin there is a great supply out ther of those wheel and even then a tire would be a problem. Same with th Volvo. Given the tire sizes run, 7 or 8 is probably optimum.
fitment still better. Maybe a tweak would be all rims the same size. Dos that help anybody?