That part is a plate that takes the sub box and bolts it to the vehicle. 2 bolts under the sub box mount to the plate and 2 bolts mount the plate to the trunk floor. The sub is also mounted to the vehicle at the top of the box with one bigger bolt.
To be honest, I'm not sure the 2 bolts on the bottom attached to the plate are really that necessay. They are 2 10mm plastic bolts and I didn't torque them down by any means. It does help keep the box in place but this plate could be easily made if the cost at the dealer is too much or not available.
Bottom line, don't sweat it too much. Sorry I don't have a part number nor a cost on it.
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