The driver side front window frame unit was assembled today. Although it looks simple the window unit consists of 3 different pieces of glass, 8 different rubber seals, and 4 metal frames. Installation of the vent window seal into the vent window frame is widely regarded as the most difficult tasks in all of VW bus maintenance, right next to headliner installation: it lived up to the reputation. The unit was installed into the door frame and it sealed well, although readjustment of the door hinges will be necessary. Unlike any modern vehicle, or even other vehicles from it’s era, the bus has a sliding window (back/forth) instead of a retractable window (up/down; Because of this the fully open window opening is surprisingly small but between the flow-through ventilation, vent windows, and safari windshields there should be plenty of airflow.