So I did comparisons between the GTI and Passat/Tiguan rear knuckles...most of the bolts are the same, including the calipers. The top and bottom toe arm bolts are longer, 115mm vs 95mm. You'll need 4 total.
Part number N91076701
https://www.ecstuning.com/ES471835/
Mg_90 tipped me that the bolts for the trailing arm are longer as well, 40mm. You'll need 4 of those too. N10628401
He also tells me that we gain 10mm track width each side, for 20mm total increase.
Complete REAR hardware for Passat upgrades
N91076701 x4
N10628401 x4
For the aluminum fronts, you need longer pinch bolts, caliper bolts, and I opted to get new Passat ball joints with nuts. You'll also need a couple flange nuts on the tie rods that I forgot to order before. To my disbelief, it looks ECS tuning now has free shipping with no minimum!!
Nuts part number N10106402
Edit- complete FRONT hardware list for Passat upgrades
N10106402 x4
N90954802 x2
N91084901 x4
3C0407365A Febi left ball joint, includes nuts
3C0407366A Febi right ball joint