help
On my 66 Coronet, which was ordered without a radio, there is no hole in the fender.
Makes finding a replacement kind of a pin, if you're a stickler for those kind of details.
Some factory service manuals have templates for drilling the hole in the factory location, if a dealer installed radio was ordered.
My car does have a "factory" radio, bu has dual angled antennas, professionally installed on the quarters (~~~).