Installed a rear 18mm spacer kit from Achtuning (plus bolts) and installed them yesterday. Haven't driven the car yet, but thought I would post some before/after pictures. Need to take the car to my local indy shop to inspect some issues with one of the bolts being a little cross threaded (long story).

Car is a 2013 S5 with 19" Hartmann Rotor Wheels, H&R OE lowering springs.