69 cuda trunk extensions

hey guys i have a question for those who own a body cudas i need to replace my trunk extensions on my 69 . can dart extensions be used with modifications or other a body extensions? they dont reproduce these parts exclusively for any a body cuda and im getting antsy to finish my repairs and this is the only thing holding me up. anyanswers or suggestions would be greatly appreciated.mine are completly gone and i havent been able to locate even decent used ones any better than what i have. thanks