[Oldie Goldie]

462ron well if your father bolted anything to the top of that radio, than it rules out the newer 1954-
12v Buick Sonomatics because they have a big metal scoop up top for the dial light.

In the boxy 980868 model before, you had to go through hhhhhell just to change a burnt out bulb. Awkwardly get the radio (which weighes almost as much as a small bowling ball) out from behind the dash, and taking the radio apart to get to the bulb!!!
I gues on the "next gen" 12v babies all you need to do is reach behind and yank on the metal fitting, pull out the spring thing and change the bulb. Put it back in.