Humm... well... the guys at the dealer told me the spare was from an e46. Looks like thats wrong(e90/92). I really don't care. All I know is it fits and works!
Plus... they even had it instock(!) and they were really keen in giving me a big discount IF I bought it. Which I did. I was going to get the e60 "kit" (wheel/tire and jack) but that was really expensive. I think 100 euros more, 300 euros?
Also with this alloy wheel you do not need to buy differnt wheel bolts! A big plus in my book. Who wants them rolling around in your trunk! Or trying to look for them on the side of the road!