I believe that the Nissan ones are made by McGard, the McGard part number being 21153SU. Halfords do them:
McGard Standard Locking Wheel Nuts 21153SU
Their photo is wrong though and there are cheaper places like Amazon:
21153SU Wheel Lock Nuts SU M12 x 1,25, flat seat, Overall length 15/35 mm, Hex size 21mm, Key diamter 27,7 mm