If memory serves, the stock 18" rims are 45mm offset. My new wheels are 40mm and they fit perfectly, even with the 1" drop.
2012 Platinum Tri Coat Titanium Hatch
401A, Heated Charcoal Leather Seats, Nav, Sync,
MFT, Moonroof, IA w/ PB start, Eibach lowering kit and 18" Platinum Apex 200 wheels
My other ride -2006 Performance White Mustang GT