You have a basic console. Many of the console do have the molded grille slots even without the optional sub. The factory sub consists of an enclosure with amp that takes up most of the inside of the console. You can't just put an open sub in there. The console is too flimsy and not sealed
There are plans to build an enclosue to put in the console if you really wanted to. You are better off buying a small powered sub. There are a number of them aroung that will fit under a seat.
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.