Testarossa radio delete plate

Does anyone know where I can find a factory radio delete plate for a 1988 Testarossa. These went inside the dash where a stereo would go & most of them where thrown away when radios were installed. I believe these delete plates where actual rectangular shaped pockets that went inside the dash? If anyone has any info on one of these, please let me know. I have a factory stereo delete plate in my 328GTB. I dont listen to the radio when I drive, the engine is all I want to hear.