found the specs..
Front: 18x7.5", 5x112, ET35, 225/40/18, 66.5
Rear: 19x9", 5x112, ET22, 255/35/19, 66.5

also found this good info on stock size, dunno if im fan of much of those wheels..
http://www.ronalusa.com/cars/chry_crossfire.html

you might be able to pull off those 19x12s if you get them at a et30.. that would give you a nice dish and flush to the fenders.. as for the fronts you don't need to go much wider than stock.. 18x8.5" with a et of 35, should put those flush with the front fenders..

later..