Eckler's Premier Quality Products 57136052 Chevy Radio Antenna Front Fender Round Ball Top Mast Best Quality Reproduction 1956 or 1957 Chevy TriFive Antenna Round Ball Mast Top As Original Our antennas are made to the factory specifications and include the mounting template for a trouble-free installation Assembly Is Complete With Triple Chrome Base, Gasket, Nut, Template, Bracket &amp; Complete Instructions Chevy Radio Antenna, Front Fender, Round Ball Top Mast, 1956-1957