I am assuming you're moving to 17" wheels to
clear your aftermarket calipers (nice choice
BTW). For a 17" by 7" wheel you're looking at
a 40 to 42 mm offset ideally. Bolt pattern is
4x108mm no matter what; the offset will be a
little different on a 7.5" wide wheel though.
I second the recommendation to contact Luke,
he's the guy to talk to at the Tire Rack when
it comes to wheels and Contours.
T.