The flow through vent was used on the 1947/1950 models as they did not have the door vent wings, they came with the 1951 and up models. I do not believe they make the 1947/1950 side vent cowl replacements, you will have to use the 1951 and up cowl panel and add your old vent. They do make shorter cowl patches that allow you do leave your vent in place. This interior patch panel is correct for your year when replacing the inner cowl panel.