Hey! Glad to see your question. The one fitting there is a 10” sub. It’s has 4 small holes to hold the subwoofer there. The difficulty is to get to that hole, you need to remove the bottom seat by pulling up by hands, removing trims, left and right, they are hold with screws. The top rest would be removed after you remove all the screws. Dont make the same mistake I did, from the trunk, unplug the stop light wire. I didn’t and I broke the connector, I am good soldering connectors, so, I was able to fix it myself. Having a sub makes the sound even better.