I have the BEC104 camera (and a AVN8804). Check this thread out for some pictures:
http://elcova.com/groupee/forums/a/tpc/f/6706011751/m/5...841039601#4841039601
I also used a PAC SWI-X interface so that I could use my steering wheel controls with the Eclipse head unit:
http://elcova.com/groupee/forums/a/tpc/f/6706011751/m/7.../746104788#746104788
I used Peripheral GMAH24B and GMAHCM units to interface to the factory Bose amp and retain chimes and Onstar (although I removed the Onstar unit). I connected the factory roof mounted Onstar antenna to the Eclipse AVN8804HD unit I have and the navigation works great.
Mark