The rocker panel is the lowest body panel on the side of the car located between the two wheel wells and in some German cars, it's prone to rust and damage over time. Due to its location, the rocker panel is not covered by the carpet or leather that covers most of the other components, so any damage that occurs will be rather visible.
If you have rust issues the only real way to fix it is to cut out the rusted area and weld in new metal and when you decide to embark on such a task, anything to make the job easier is a must. These pre-formed rust repair panels are made to exactly replicate the most troubled areas that commonly rust beyond proper repair, making it simple to attach them where they need to go.
