I need a window regulator for the driver side front door of my '68 Dart four-door. I posted a parts wanted thread. Two questions to help in my search: 1. What model year regulators will fit a '68. 2. Are regulators the same for two-door and four-door, and front/rear. I suspect they're the same because the bottom-stop bumper has four positions in the regulator frame. (See the lower image).