And you can buy "copy" of it from different manufactures here you got some part numbers:
Reinz = 81-35916-00
elring = 728.880
Ajusa = 15083100
Corteco = 20033872B
Goetze = 50-319551-00
Type: Posts; User: RS8
And you can buy "copy" of it from different manufactures here you got some part numbers:
Reinz = 81-35916-00
elring = 728.880
Ajusa = 15083100
Corteco = 20033872B
Goetze = 50-319551-00
You don't have to buy the whole flange as mentioned, you can buy only the OEM sealing,
here it is with part number:
https://www.rs6.com/attachment.php?attachmentid=19182&stc=1