IDparts.com has them - the set is very nice, I did those, plus the Tiguan front springs and Koni specials all around. Raised the car by about 1.5" and the ride is great.
I planned to install Airlift bags (which do NOT lift, they just "lock" the spring height when inflated so you pump them up BEFORE putting the load in) but have not done so yet. I might not since the ride handles the trailer without issues so far.