You actually may have to buy some plastic sheets and make an adapter ring to hold it in it maybe be smaller than the opening. It should fit though if you make a adapter plate and use the tweeter pods. Sort of like this notice it is cut almost like a stop sign to fit in there but this is in a porsche.
Here is the plastic you need or may need
http://www.crutchfield.com/p_1208900...t.html?tp=1114