I know this thread is a little old, but I wanted to help out in case you were still looking for this.
This cable may be what you're looking for. If you post the exact model of the head unit I can tell you for sure :)
Hope this helps!
Looking for some good OG tags. Real words, 3 letter words, etc.
PM me here with some tags prices and we can go from there. I have Kik and Skype but I don't post them online.
Money is not an issue, but don't try to rip me off :)