1971 and 72 quarter panels

Does anyone have any ideas or sources for quarter panel repair pieces for a 71-73 Cougar? I don’t need to replace the whole quarter, just the sections in front and behind the rear wheels. Has anyone modified the repair pieces available for the Mustangs of the same era? What about fabricating your own out of sheet metal. It seems like the contour shouldn’t be too hard to duplicate. However, I am speaking out of ignorance since I have never actually fashioned a panel before. I’ve tried WCCC, but according to Don, the panels he currently has available are no better than mine. I appreciate any thoughts or ideas on this topic. Happy New Year to all.