BLACK Steel, 3 in. (width) X 20 in. (diameter), Universal-Fit Radiator Fan Shroud With Mounting Hardware.
Trans-Dapt Performance Products offers a nice selection of cooling system accessories, including aluminum radiator overflow tanks, radiator support bars and panels, water necks, stainless hose kits, and sharp looking radiator fan shrouds like this. The shroud has a 20 in. diameter, and is 3 in. deep. Mounting hardware is included, and is east to install.