I have a set of 4 BMW style 142's and Continental's ExtremeWinterContact 205/50R17. Setup is square, 7x17 ET 47 all around. TPMS (I have a 2012 135i) is installed and included.
Tires purchased from Tire Rack and installed by dealer locally on the 142s. Lots of tire left, used about 10k miles.
Prefer local pickup, but will ship at extra cost.