I'm looking for a tailgate window regulator with motor as well as a windshield wiper motor. Does anyone know whether these parts are interchangeable with those from any other 1960s Invicta (or Lesabre?) wagons or maybe even other full size GM wagons from that era (e.g., Oldsmobile or Pontiac)? Can anyone recommend sources to try (specific parts manufacturers or salvage yards?)? Any assistance will be greatly appreciated!