he needs it the other way around to a standard iso adapter tho
only way todo it is to find a k12 (down the breakers) and chop the hu loom out of it and get a iso plug from maplins and make a lead up to suit as you wont get one off the shelf
one thing i am not sure about is the security and if the new hu's are "married" to the ecu
edit. you may be able to get a repair loom from autoleads if you cant find a K12 or another nissan with the new hu in