I'm running 10mm wider at the front and 20mm wider at the rear, so the top corner of my tyres will be 5mm and 10mm further out than yours. I'm effectively running a 6mm spacer at the front and a 1mm at the rear.
So if you got 11mm at the front and 11mm at the rear the top corner of your tyres would be in the same place as my car. I think that 10mm or 12mm will be around right
https://www.6post.com/forums/showthr...ht=325%2F30r20