i need help with my 70 dart

If you want to go the used part route, the front fenders from 70-72 Dart/Demon will work. Valiant/Duster front fenders lack the extension on the front and the wheel opening is different from the Dart/Demons. Rear quarters from the same years Swinger/Scamp twins ought to work. Shipping sheet metal around can get expensive. Recommend you save the $s and try to find it local. That way your version of slightly dented or rusted is the one that carries the day. If you pull it yourself, you also get an education on what you will need to do on your car.