I had one and had to make one. They aren't hard to fab. It's just a 1/2" wide piece of sheet metal that you bend to the contour of the door frame. The hardest part is gettig that little roll at the upper edge. I used a 1/4" dia. rod to bend the strip around then, formed the rest to to match the door frame. The outside edge just tucks in between the door and the window track. Drill a screw hole and your done.

Good Luck
George