No, you can't use the stock cable selectors, my system uses vacuum servoes, but they now have electric servoes.
To plumb to the stock outer vent housings, I used the stock hoses, they fit like they were made for it. I custom made my center section, and added 2 vents. I used the hose supplied with the unit and a "Y" section to hook it to the center spot on the unit( it only has 3 outlets for AC).
Like I said it works great!!! When I drove down to Montgomery for the HybridZ shootout, it rained most of the way there, I had no problems with fogging, where others were complaining of fogging up windows.