A local audio shop named Autosound (Elizabethtown, KY). Since then, I removed the 10" subs so that I could make custom fiberglass enclosures in the rear (false floor). I may end up just selling those plates, but I haven't really checked to see if they're sealed to the plastic (?). IMHO, inexpensive 10s that require over 1.25 cu ft would sound best in those cubby holes. There's quite a large volume of room in there!