I'm not sure. The last time I was on Torrie's site, the catalog was pretty much non-existent except for performance tuners. I suspect he's going or gone away from the OEM supplies and is only dealing in performance stuff now. Have you tried Rock Auto for the Aux pump?
Sorry for the delay in responding, I've been out of town on vacation.
Audi/VW seem to be pretty good about keeping their service manual information pretty tight. When my wife had her Passat I ended up buying the Bentley manual because I wasn't having luck finding anything else useful.
You might try Alldatadiy.net or just digging in. Some things on Audis are pretty stright forward.