Hoping this sorts out a clear cut case and is sorted out for you without too much stress, after all you have purchased the car you love and don't need the edge taking off it.
I have a custom made 350z sub box fits in the aperture of original Bose sub. Fitted with a Rockford Fosgate sub if interested. I'm currently running Focal Speakers .
The car cruises in and around Oxford street in London support these in a big way, however i did see video once of a guys rear bumper caught fire, totally unaware until the guy following bought it to his attention.