The 1M/M3 arms will fit, but they are slightly oversize compared the stock parts. Many people have them installed, so its definitely possible to persuade them to go into the stock 135i crossmember/front subframe. In my case I had a mechanic install them with all kinds of other suspension mods.
There is a current thread about the fitment aspect:
https://www.1addicts.com/forums/show....php?t=1518918