Our large 3M pad is designed to fit in the lids of most aluminium panniers and is sized to fit the entire lid surface for maximum adhesion. An alcohol rub is provided to clean the surface thoroughly prior to fitting. 3M recommends that the pad is warmed prior to installation and pressed down firmly with a smooth object like a large spoon to expel any air. Allow 24 hours for adhesion to cure. If you have any questions email or call us.