I have a set of 15' OEM "bottlecap" alloy wheels with 2 winter tires and 2 all season tires on them. Never used them as I bought the car this summer (1994 320i just like yours.), and the wheels came with the car. I'm also running the same type of wheels right now! (means I have 8 identical wheels!)
Willing to let the spare set go for pretty cheap. I'm planning to get winter tires on one set and go for 17 or something next summer, hopefully. Where abouts are you? I'm in Mississauga.
Let me know if you're interested. Not looking to make a big profit here, and need space in my garage too.
2002 BMW 745 Li.