AudiForums.com - Help. Info on inner window / panel rubber slot seal guide

Hello
I am in need of your vast experience.
I am in need of a new inner window / panel guide slot. (if that is what it is called) I have gone to the audi dealership and they could not find it. I have a 2001 MK1 Audi TT quarto convertible. I recently had my door panel fixed and was told the rubber piece (guide) between the panel and the window was not there and need to purchase or else the panel will get destroyed again. I am asking for help in finding the part number for this piece. I am having a hard time determining if part# 8N0831617 is the correct one or if it is something else.
Once again I am in need of the inner seal / slot/ guide rubber piece between the window and panel right side.
If someone can help Please
Jose