Dimming rear view mirror fit problem

[green A8]

Having got back our 1996 P reg 4.2 QS over the freezing cold Easter holiday weekend, I decided to add a dimming rear view mirror that I bought ages ago to the car to replace the standard mirror. A fast and easy upgrade to please the Wife who's car it now is and earn a few brownie points in the process.

So, I remove the old mirror, which in fairness almost fell off at the slightest touch. It had been re-attached to the windscreen at some point but not very well! I also removed the small centre visor that lurks behind the mirror and the interior light/sunroof switch plastic moulding. I then set about looking for the mirror wiring plug....Errr I can't find the damn thing. Where do Audi hide them? I thought that being a 1996 MY car it would be fitted with the all singing all dancing 'universal' loom, not a bespoke one. Can anyone offer any advice please or will I have to find some other way to wire this part into the loom?

It's a bit of a bugger as I planned to fit an electric rear blind and a solar sunroof not to mention heated rear seats. I've got all the bits. I assumed that the 'universal' loom was lurking with unused perhaps blanked off connections just waiting to be plugged in. It would seem that this might not be the case

The car was registered on 12/09/96

I look forward to your replies. Thanks or reading

Paul.