http://www.bimmian.com/iPod-Integrat...r-E91-3-Series" rel="ugc" target="_blank">http://<a href="http://www.bimmian.c...1-3-Series</a>
unless you're rocking a e92 lci or newer. (there is a table on the right side of the page that breaks down the cables and differences.)
of course if someone knows something I don't I'm all ears. but trying to save you the 70$ and the anticipation it might work.