3 mechanical levers to cabled louvers. the forth is for the fan which is connected to electrical switch. I was just looking over the filling stations (fillingstation.com) web site. They have a link for recently discovered NOS parts. They have the 4 knobs.


~ HB
1966 Chevrolet K-10 | Ghost: formerly Flappy Fenders | In the Stovebolt Gallery
1962 Chevrolet C10
1962 Suburban