Well it happened again, thought I posted this put came back and it twernt here.
Master Parts Catalog 1929-1950; gp. 16.083... 1947-49 ALL... SCREEN (4 21/32x9 1/16)... pn. 3684234
My thoughts are this; If dealer installed, the screen probably came in the radio accessory package, if factory option then of course it was installed at that time. I is no doubt the equivalent of a speaker Grill-Cloth material. If the truck was not equipped with a radio then they probably simply used a cardboard filler for the grills back ground.
Denny Graham
Sandwich, IL
