may have solved the issue ,won't know untill tomorrow when the studs show up from LA but the 2012 Jeep Grand C.has a 14mm X 1.5 studs and the note in the parts says something about it being the change for Dodge 2012,2013 on forward.
Part # 6509858...Dodge still claims no change in the studs from 2011 9/16 X 18 to 2012 even though it is called out in the manual and they are 14mm x 1.5