This plastic panel affixes to the radio bezel from the backside. Very rare item... For example, according to
Kevin Marti, in 1971 only 1451 Cougars came equipped with this panel. The reason a car would be ordered radio delete from the factory was often the dealer knew he would have his sales people upgrade the customer to a stereo or 8 track. Sometimes people would special order their cars radio delete as they knew they would be taking a trip to the local stereo store within the first week. Rarely does a car go decades with nobody opting for a sound system in the dash at some point...
Ford part # D1ZB-6504371-BA.