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We mounted the box directly over the rear axle since the mid-60s A-body cars have a good flat section to work with. This way, the speakers are facing forward and will "fire" through the back seat. Since the subs are designed to exclusively deliver low frequency sounds, they'll penetrate the rear seat without a problem. We mounted the box from the bottom with some wood screws and from the top with a couple of angle brackets to tie it into the package tray.