Here's the link for the drawing in post #98:
http://www.partsbase.org/vw/passat-pa-us-2012-25366-exhaust-gas-treatment-system-for-vehicles-with-selective-catalytic-reduction-scr-see-workshop-manual/
And here's the part nomenclature for the above drawing:
. exhaust gas treatment system; for vehicles with selective; catalytic reduction (scr); see workshop manual; 2.0 ltr.; common rail; diesel eng.
1 561131878B reduction agent tank 1
2 WHT004793 o-ring 1
3 3C0131980 end cap 1
4 561198970 heater element repair kit 1
5 7N0198975 lock set heater element 1
6 2E0201485 ventilation union 1
7 561131213 clip 1
8 3D0971838N cable ties. cable ties; 4,5X200 1
9 2E0971350M cable tie with fixing. cable tie with fixing; tab 1
10 561198969 repair kit for fuel. repair kit for fuel; delivery module 1
11 2E0919050T gasket set 1
12 561131977A insulating piece 1
13 7N0941329 control unit for reduction. control unit for reduction; agent metering system 1
14 3C0906651 evaluation unit for reduction. evaluation unit for reduction; agent reserve 1
15 N 0195307 hex collared bolt. hex collared bolt; M8X25 3
16 561971830A bracket for connector housing 1
17 561131983 supply line for reduction. supply line for reduction; agent 1
18 1J0973702 flat contact housing with. flat contact housing with; contact locking mechanism; matching contact housing:; 2 pin; black; 1J0 973 802 2
19 3D0971838N cable ties. cable ties; 4,5X200 X
20 561131984A supply line for reduction. supply line for reduction; agent 1
21 1J0973802 flat connector housing with. flat connector housing with; contact locking mechanism; matching contact housing:; 2 pin; black; 1J0 973 702 1
22 . injector for reduction; agent; see diagram, item:; 253-65,29
23 G 052910A2 urea solution adblue. urea solution adblue; 1890ML 1
23 G 052910A4 urea solution adblue. urea solution adblue; use only in conjunction with:; container; 10 ltr.; white; VAS 6542; VAG 1383A/1 X