Rear pan is made of 18-gage electro-galvanized steel and will bolt or weld on depending on your desired look. The curved shape of this rear pan matches the contour of the bed sides below the tailgate. We predrill the mounting holes in the pans and a "bolt-on" hardware kit is included at no charge. This rear pan has 7 rows of 4" louvres without the license tag indention (tag box).