Not sure how the offset number plays into this as I believe the OE offset is 52. Everything is stock and just considering a modest upgrade to 16x7 et40 on P205/50/16. There's a lot of discussion on rubbing so I don't know if this is an issue when choosing a 16" wheel with a 40 offset for an '08 Focus SE - will the wheel still be inside the well or will it protrude out a bit? Are any additional parts/labour required to make this work? If anyone has pics on this setup, that will be handy. Thanks for helping out.