On a 52 chevy pickup need to find a kit or someway to change door gl*** to single gl***, do away with the vent window.
Simply build a channel in the front of the door, parallel to the rear channel. Any gl*** shop will cut you the gl***. Ok, not simple, but not really all that hard to do.
is the vent angled from the side gl*** or is it truly flat? you may have to do metal work for it to fit.