And btw... this 1M car you refer too... the headlights are US spec ones... just with a black film(foil) over the orange corner reflectors. The 1M does have a different eye brow LED lamp, but you can always replace your headlights IF you want that look. The doors are the same as on your 135i - its just the 1M has the M3 style mirrors and the lower side skirt if different.
The 1M does have wider track than the 135i does. Its some 4cm wider at the front and back. You can really see how much wider the 1M fenders are flared in my photos I posted above.
Dackel