My '57 had a Philco am radio cut into the dash, antenna is drilled into the cowl on the drivers side. I don't know where the dealer would have mounted one but I think the cowl was common.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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