I'm not sure if it is an OEM tow bar or a 3rd party one. It does have the Citroen trademark in that it took me ages to work out how to actually attach the towbar in the first place
But basically to fit this one you need bend a spring loaded lever practically all the way round with a button that allows it to go futher or so and you put it on at a 90 degree angle and then rotate it vertically for it to clip in place. And then have an obligatory citroen do it again twice until you get it right 
Anyway, does anyone know where I can get a replacement? I would prefer not to attach the tow bar permanently as this screws up the reversing sensors as it always thinks I'm going to hit something