A redesigned dash was placed in the 1954 GMC. It was totally changed from the 1947-53 dash which had been in place six years.
Due to this new design there was a place to install the radio but not its speaker! The next best location for the speaker was in the headliner between the driver and passenger.
The GM engineering department realized that a protection was needed to protect this speaker from accidental contact with someone’s hand, a gun barrel of a hunter, or most any long item carried in the cab. The result was a metal perforated cover.
No doubt this was excellent speaker protection however, the heat from the metal cab roof in the summer probably did the most deterioration of the speaker.
In Place in Headliner