Yes, the A7 is what we usually use for winter, but we will do any 18" wheel that fits if you would like. The A7 is a nice price and fits with no extra hardware needed, but anything that fits is fair game.
For our esteemed colleagues of the frozen north, check your OEM valve stem. If the valve stem is metal, you need sensors in the wheels or you'll get the error light. If you have rubber valve stems you do not need the sensor. Most do not in Canada.
I have accepted a new position at Tire Rack and am no longer in the sales department. firstname.lastname@example.org
is available to assist with M3 questions.