These original 1965-1966-1967-1968 Chevrolet Impala OEM Hardtop or Convertible LEFT/DRIVER'S SIDE door window regulators are an original GM part that has been fully restored. We replace any gears or nylon rollers that are broken or worn down. Often the springs are broken or the main rivet is loose causing the regulator to fail to raise the window all the way up. In this case, we install new springs or rivets so as to ensure that the regulator will work properly. When we get done with them they look and function like new.