It may be a bit "ghetto" but it works, looks clean if you're not taking a careful look, and i haven't had a single problem with it coming loose. Plus it takes about 2min to unhook for track days and such.

 

I have been trying to find a way to make this work since christmas. My wife bought me a cusco and I didnt want to take the sub out. I havent been able to find a post about this. thanks for the pics they are very helpful.