Posted in the Roadster forum, but no response yet, so posting here also:

I want to replace the stocke Bose sub with an 8w7 or 10w7 and wonder if anyone here has replaced the stock sub and know the dimensions of the stock sub location, mainly the depth of the location. I have read about the holes in the area that would need to be sealed to use it as an enclosure or build one into the stock location, but not sure exactly which one will fit with the least amount of modification to make it work.