Radio/Subwoofer realated (trying to find an old post)

Hey guys, I need a little help. Im considering a new subwoofer setup for my car. (Notch). i remeber a while back someone fiberglassed the spare tire well and setup a sub that way. Does anyone kno what post im talking about? How about a link? i searched but its not coming up. I loved this setup and i plan on duplicating it so any help or insight is appreciated.
 
Its not hard to do, just have to measue the spare tire area and decide on how you want your speaker(s) mounted for your performance needs. Most people mount a single speaker in the spare tire void and use fiberglass/plywood and foam to support the gaps. Get with a local stereo shop, they could offer some unique tips.