How does the genuine metal Volvo dog guard fit in to a v40? I've got two metal bkt's on the rear of the back seats, and two black plastic rings in the roof above the back seats. Will I need any additional fitting kit, or will the dog guard just fit in?
I understand that the dog guard will rest in the bkt's on the back of the seats, but how does it attach to the roof?
I'm looking to buy one from ebay, and don't know weather to bother bidding on item's that are "guard only" or "without fittings".

Any help appreciated.