Rear Fridge/Coolbox - Help required

Hi Forum
 
Just wondering if anyone can shed any light whether the W220 was pre-wired to accomodate the Rear Armrest Fridge?
 
I have seen one on Ebay, and is 90% cheaper than retail - I can only assume that this easy to wire up - BUT life would be a lot easier if anyone knows that the cars came with pre-wiring
 
All help appreciated
 
Nik (UK)

I have never seen one offered by MB  at least in the US. Maybach has one and so does Lexus but they are part of an executive package!