Installation of GRA for A6 Automatic. Quattro

Hello everyone,

I have been following this community for a while and they were very helpful to me in my search for an A6. They are the best forum I have seen for car enthusiasts.

Now I have one, unfortunately without a GRA.

I have already read the posts on this topic, but I just wanted to know if the installation is suitable for an A6, manufactured in 1999, with a 2.5 TDI automatic transmission. Quattro differs from Audi A3 TDI (Good Fahrt) or http://www.jagiella.net/dirk/auto.htm Golf/Passat
and if so, what should be considered?

Thank you in advance.

Samy