66 Dart Convertible window regulators

Nothing special or unique about the convertible front window regulator. It's the same one used in the Barracuda and 2drHT Darts and Valiants. It sounds to me like you may have a guide problem if the window tilts back out of the vent window frame. There could be a problem with the glass bracket too. You won't really know for sure until you pull the panel and look.