X5 E70 bike rack

[WhyTwo]

I'm about to buy a tow bar mounted 4 bike rack for my X5 but have heard rumours of a towing eye mounted bike carrier. A search of t'internet shows up some US based BMW sites talking about them but I can't find anything in the UK. BMW website shows a 2 bike carrier but not sure if it's towing eye fixing.

Anybody got one/know where I can get one?