I have the F type V8 S and would like to get more tire under the back end. 335 or 345 25 VR 20s looks like the right diameter but would require 12.5" wide rim width instead of the stock 10.5. Anyone measured the available space within the wheel well or have an idea of the back space and offset that will work? Finally. I assume that the wheels will need to be custom made (by widening a stock set). Does anyone know who manufactures for Jaguar the 20" black Tornado wheel that is an option on the V8?