Greetings! I own a 2004 Cadillac DeVille Base Model, 4 Door Sedan with a 4.6L V8 32 Valve Northstar Engine. The rear subwoofer behind the back seat and below the rear window in the center of the car needs to be replaced. I'd like to replace the subwoofer with something that will mate to the existing bolt pattern, and wire size/disconnect receiver. Can anyone tell me the original size, i.e., say 10 inch diameter and wattage of the original subwoofer? The cadillac dealer advised the part has been discontinued, and are no longer made, and there are none in stock. Parts manager could not give me any physical description of the original subwoofer, or recommend a replacement part that would drop-in and fit. Please help me, if you can and recommend a drop-in subwoofer with same fastener pattern and electrical connection details. Thanks, Steve.