That cardboard is tough to cut and crumbles when you try to cut sharp turns. With the intricate cuts that you would have to make around the lever and louvers, I don't think if would look good even if you found a way to make perfect cuts. I believe these panels would be a better option on a 51 or newer truck, as they don't have the side cowl vent. Or you could make a cool louvered metal cover to put over the cardboard.
