I just bought one of these from a U=Pul yard.
Used part: $35 for OEM power brake systems on recent VW/Audi diesel applications.
I pulled one off a Passat; the pump was mounted on a hefty bracket, in front of the ABS valve block.
[IMG]

[url=https://flic.kr/p/22sSdWU]s-l400[/IMG]

[url=https://flic.kr/p/FzRKYa]s-l400