A5 Andy

Hi Guys, New to this but thought that I would log in and ask advise of other Audi fans. I have just purchased an A5 3.0 Quattro Sportline Convertible TDI on an 11 plate to tow our caravan after the A4 proved a little light. We have had a Westfalia detatchable tow hitch fitted and there is a storage option available part number is 8TO 012 109C. This doesn't come up on the net as the part required. Does anyone have experience of this storage device Many thanks Andy