Bull, not sure on the routing, I'll go out tomorrow and look for you, but I do have the little metal thing the cable goes into on the doorpanel. Not sure how the hell you got a cable without one because that cable pissed me off to the point I ripped it out of the door, broke the mirror and cut the cable after it was out to get the frikin mirror off in my first Camaro.
I do beleive the cable goes above the window follows around the inside of the door to the mirror. Don't remember, but will look in a few hours and send you an e-mail. If you want that little metal thing let me know, I don't need it.