it wasnt a clearance as in fit issue, the inventor, a fella by the name of John Victor Pritchard would not allow its use as Nissan were tight asses and would not pay the required sum to him due to it being a patented item. So Mr Pritchard would not submit the required paperwork to Japanese government to give Nissan "clearance" to use it. Toyota was happy to pay the money as they knew the enhancement it would make to their vehicles was worth more than the patent fee outlay.