would this be it??
https://www.autometaldirect.com/store/productdetail/654-2067-2R/67-76-Dart-72-76-Scamp-Deck-Filler-Inside-Patch,-RH?view=productdetail&stockNumber=654-2067-2R&BOMReference=&selectedcat=Deck%20Filler%20Patch&prod_cat=654&desc=67-76-Dart-72-76-Scamp-Deck-Filler-Inside-Patch,-RH