Offset Question for a 2011 Camaro
 

Hey guys, trying to help a friend out, what's a good offset for a 2011 Camaro with 20x8 in the front and 20x9 in the rear.

Any feedback would be helpful, thanks!

-also these are the rims just bought the 20x8.5 for front and 20x 10 for rear http://www.carid.com/giovanna-wheels...lb-347520.html