Google turns up lots of inexpensive options to replace it. The main problem will be color. If it's black no problem. If you don't care, no problem. Replacing it on my '07 base was too easy to even think about Googling it--as I recall an interior panel popped right off and there were two or three screws and a plug.
My GT seems to have a tweeter built into the triangular pieces inside the mirrors.
I don't see how to release the pieces to replace the mirror assembly.