Just last week I called Autohauz AZ and pointed out that they list a TDI valve cover gasket for the AAZ code motor.It can be a pain. Part numbers are your friend, copy of ETKA wouldn't hurt, the vag-cat site might still be up too.
There is a catalog available at http://vagcat.com/
vag-cat is your best bet, it isn't easy getting ETKA, or easy getting it to run since it's a bit of a hack to run it without an account.Then there is the version bit, too new will be missing a lot of NLA parts for older stuff.If you get stuck on something PM me and I'll see what I can find out.
http://www.partsbase.org/vw/ is better than Vagcat in my opinion.
I use Utorrent, and this download of ETKA looks good. http://thepiratebay.se/torrent/3639717