How do you mount a modern day stereo in the humungous plastic grey stereo holder that the company has supplied? Is there adapters for it or do i have t make my own. The directions that came with the deck say basically "this is how you mount it in a toyota (its a sony, go figure) and after that bug off." i have heard of people making mounting boxes out of military ammo boxes which i have plenty to spare. Any help would be great.