How old is your set and any issues with the c/o set and in the install? I've read of some defects in some of them that you have to drill a hole or dremmel the holes so as to make the matching holes line up for the bolts to go thru?
Maybe the defective ones were from the early production runs in 2005-2006 or may not even be applicable to e46 application?
Like i said i've just read them on the net. I can be totally wrong. Shed some light if you will/care