http://www.ebay.com/itm/Mopar-67-68-69-70-71-72-Dart-Valiant-Duster-Demon-Door-Window-Hardware-Kit-NEW-/360780132757?pt=Vintage_Car_Truck_Parts_Accessories&hash=item54002bf195&vxp=mtr
sorry here is the correct link James
You can buy the parts on ebay...keep in mind you will need two sets one for each door..not cheap but factory repo parts and cheaper than pulling your hair out!
Bought a set works fine...