Leaky cowl vent? Every one does. We now offer the perfect fix for cowl vents. THE 54/59 COWL VENT FILLER IS FOR THE ONE PIECE WINDOWSHIELD. This filler panel is to be welded in. It features a slight angle down around the edges so you can weld and then use minimal body filler to make a perfectly smooth finish. It is also the exact shape of the original except larger to fit in the outside opening.