sjm is a great source for all kinds of info. Scott mockry is the guys name how runs it, he's in portland. Can get everything audi in terms of parts and has very good pricing and support. Highly recommended.
And speaking of AAN parts. Just ordered the oil sump restrictor. Just under $32, but it needs two gaskets versus just one like normal, so add whatever it costs for either a 10v or 20v gasket would cost ($15-40). The 7A part, which bolts inside the sump is $33, plus 4x bolts & washers, so it ends up being around $38 from the dealer. Audi, to my knowledge, never bolted that restrictor into any 7A engine, despite it being in the parts fiche.