Arlington DBHR141-1 Outdoor Electrical-Box Adapter Plate for Existing Siding Retrofit Construction, Horizontal, 1/2-Inch Lap Adapter plate converts the flat surface DBHR1 for use on existing siding Comes in multiple sizes, make sure your siding style matches the siding adapter size Horizontal Siding Type/Style Fits: 1/2-Inch Lap UV rated plastic is paintable, designed for long outdoor life Purchase includes: Siding profile adapter plate, installation screws, and (1) roll of caulk