Hey guys, thanks for all of the info on this great hack!
Using Dyeloopers pictures as a guide, I located the purple ended cord through the slit in my April 2008 build "Just a Cooper" using
this and fished it out with a bent coathanger. No cutting or torx screwing necessary, all I had to do was move the seat all the way back.
I plugged in the cord that was recommended at the start of this thread and I'm in sirius heaven with my sportster 5. Goodbye cruddy magnet antenna.
Thanks again guys, works great!