I have found them under the bottom of the rear seat, back of the rear seat, under the package shelf liner, under the carpet, on top of & behind the glove box liner, I have even heard of some finding them between the roof & headliner. Sometimes you never know where you might find it. When you DO find it, just be very careful removing it, they are usually pretty delicate after all this time.
Hamtramck Historical - The registry for all '0B' models, from 4-door Valiants, Dusters, Challengers and Barracuda models, all are accepted regardless of condition or engine size. VIN and code information from parts cars, parted cars is appreciated as well