1954 Chevrolet Truck radio speaker mounting plate (overall dimensions of the plate: 8.36" x 10.51"):
Reproduction Speaker Plate: jpg file Reproduction Speaker Plate: Acrobat pdf file The original plate is 1/16" sheet metal (steel) with a short, 90-degree roll on the left and right edge (to keep it from "racking"). The reproduction plate is 1/8" sheet steel.
Just to confuse you, the plate was scanned upside down (to make a good right-angle alignment). The jpg is upside down but the pdf has been flipped (the right side of the plate, facing the radio, is at the bottom of the pdf). Let me know if you want a photo of the plate on the radio.
Tim