i bought up this topic before in the general discussion section and ppl just kept saying you can't put fog lights in on 135i but they totally missed my question.
my question was similar to yours... which was asking if the 128 and 135 have the same harness and the front fog lights are prewired already.
http://www.1addicts.com/forums/showthread.php?t=9479
you can read how that thread went.