They won't fit. The spring perches are a different size. They can be changed, but for the trouble, it's easier and cheaper to just find springs that fit your car. There's nothing magical about M3 springs. I have a set going to waste for this very reason. I didn't know they wouldn't fit a non-M car.
Quotes to live by:
guessing gets expensive
nothing is more expensive than a cheap BMW
Ken Kanne, Silverhill, AL, Honorary Forum Grandpa/Craigslist addict/Hoarder of all sorts of stuff
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
I NEED A NAP, DANG IT!