This is for one new 1955-1956-1957 Chevrolet front antenna hole filler plug. This plug is not for plugging the antenna in the fender, It is for plugging the hole in the firewall where the antenna would come through. All cars had the hole in the firewall for the antenna, but they didn't all have the hole in the fender because a radio was an option back then. If your car did not have a radio originally then it would of had this plug in the firewall where the antenna goes through. If the dealer wanted to install a radio and antenna for a customer back then, they could drill the fender for the antenna and just remove this rubber plug to install the antenna. SKU #2515