towbar for avant with quattro/vortex rear bumper

I know nothing about Audi tow bars but must say your car lood great.
 
Go genuine bar and electrics, looks better and more reliable than aftermarket.
I've have genuine bars on a4 avants with s line and votex rear bumpers and really there is no competition.
HTH
 
I have a genuine audi (aalko) aluminium one(with a steel ball!) which has been great. It's easy to put in and is fairly light. It has done quite a bit of towing so seems reliable.