This is a 3/8" MDF replacement speaker panel The right hand side is cut for a 5 1/4" auto speaker. Use it with two auto speakers wired in series to boost your backbox sound. You will need to add a 15 - 25 ohm cement resistor to balance the sound with the cabinet.
You will need to paint the DMD cutout surround black (more if you like), and transfer all hardware from your existing panel.
This item cannot ship in a flat-rate box.