Those grilles aren't supposed to pop off, the rear deck is all one plastic piece, including the grilles. At the car audio shop i work at we always take apart 96-00 civics by taking out the rear seat, removing the side panels, and finally pulling the rear cover off. also, don't forget to take that little plastic ring off of the keyhole on the rear piece. Finally, be careful when removing the final piece, the plastic clips that hold it can be a real bitch to deal with as they break easy. you CAN bust your grilles up too but chances are it will look cheaply done.