Hey, a friend of mine who works on car stereos gave me a big 2x12 car sub woofer box. I know enough about wiring speakers that I could turn this into a cabinet, but I need some help finding some parts. I already got a pair of 2x12 speakers from GK that are designed for the MB212 cab, the thing that I am having trouble with is finding and installing the back panel. The cab was designed for a car stereo and right now it has two seperate cups with a positive and a ground in each of them. Any links or any advice on how to move forward would be really appreciated.