Prefab custom enclosures for Mazda sedans

Hi, does anybody know of a manufacturer or retailer who makes prefabricated custom-fit enclosures for Mazda sedans? I've checked out Q-Logic and several other companies, but they don't seem to offer anything except for "universal" fit kickpanels and sub boxes for Mazda sedans.

What I'm looking for is kick panels and trunk-mount sub box that are custom-fit for a Mazda 626 or Mazda 6; you know, that hug the sides of the trim panels, trunk, etc. and take up less room than a typical prefab rectangular or wedge box. I'm looking for something prefabricated that just bolts on/in, and don't want to have to go to a car stereo shop to have it fabricated. Does anybody know of something like this?

Thanks for your input!