Does anyone know the part# for 05-08 Audi A6 Home Link(Garage Opener Unit) that's behind the front bumper on the passenger side?

The Dealer is giving a new part# 4F091971913T($900), but they wouldn't let me know the old part#(used $100).

I know that 8K0907410C is for 08-11 A3 A4 A5 A6 A8
Now this part# 8E0909511A is for 02-08 A4, A5, A6, A8

I just want to make sure that I buy the correct part and that is compatible.

Thanks