That is correct Denny.
The reason I posted the links was to show the Chevs of the 40s Part and that it goes over the top of the speaker/case, not the " . . cardboard-y black cover [?] that goes behind the dash grille in a 1954 chevy and hides the speakers from view . . "
Do you have an instruction manual or illustration that indicates that 3700350 ("used with installation of the radio") goes between the grill slits and speaker mounting plate when the radio is installed? Have you found a material that matches 3700350, and, how is is installed?
Thanks,
