What part do you need to close a gap between the fender and bumper?

To close a gap between the fender and bumper, you typically need a gap filler or a trim piece designed for that specific vehicle model. Additionally, proper alignment of the fender and bumper mounts may be necessary to ensure a snug fit. In some cases, adjustable clips or fasteners can also help secure the components together. It's important to ensure that all mounting points are tight and that any adjustments made do not affect the vehicle's overall aesthetics or functionality.