I fitted a towbar last year to my 1999 A6 Avant.I expect the mounting is the
same for 2001 model.
From the instructions that came with the towbar ( and I seem to remember
they were correct...)....
5 nuts around each rear light cluster
2 'tip' screws under each mud flap (ie at rear of wheel arch)
1 screw on the bottom edge.
I DO remember removing the chrome strip at the rear of the load platform but
sorry can't remember if this was essential or whether I did it before I read
the instructions. (perhaps that was for the wiring ?) A box spanner would
have been useful to get to the nuts around the lights. It didn't seem too
difficult a job.
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