The only RNS-D you should be looking at is the 8E0 035 192B. 8E0 is the right one for your car, index A is for the Japanese market only - stay away from that. There is also an 8E0 035 192 (no index), not sure what the difference is compared to the B. Starting with index C you get the RNS-E, index D is fine too. In Europe stay away from index E and F (or get one and sell for more to the US
).
There are not that many RNS-D for the 8E/B6, it wasn't that popular. You will see many more 4B0 and 4D0 units but they won't fit right. Personally I would stay away from the RNS-D, unless you get a complete set with TMC and adapters. The RNS-E is much easier to retrofit as it has everything included in one box. And future updates make it even more interesting.
Can't help much on the double DIN conversion though.
Good luck...
There are not that many RNS-D for the 8E/B6, it wasn't that popular. You will see many more 4B0 and 4D0 units but they won't fit right. Personally I would stay away from the RNS-D, unless you get a complete set with TMC and adapters. The RNS-E is much easier to retrofit as it has everything included in one box. And future updates make it even more interesting.
Can't help much on the double DIN conversion though.
Good luck...