This is a picture of the right side rear interior of my Oct 65 San Jose build 66 GT "K" Fastback. Although the Ford Car Parts book (Illustration-Body 290.1 pg 4) indicates a drain hose from the vent base, there is no hose, nor is there provisions for a hose (and clamp) on the base. Was this a 65 only drain feature, a Ford proposal or something designed out and nobody got informed? There is a plastic watershield there (66 Mustang Interior Assy manual pg 11). It dropped down to the rear of the door area and will get glued back in place.
Jim