Let's get technical:
Some cutting required: the rear deck speakers will require you to cutout and transfer over the stock surround for proper fitment of these speakers. Call Stage 3 at 623-434-5277 for more information.
Base Audio Only: this kit will only fit Mustangs with Base Audio packages and will not fit Mustangs equipped with Shaker Audio Systems, due to the fact that the Shaker Systems use component speakers for the front doors.