This glazing works great on the 1 piece windows which Spartan used late 1950 and 1951. The one piece windows were mainly used in the kitchens and bathrooms. If you have a late 1950 or 1951 Spartan it probably has both 1 and 2 piece windows. It also works great on the 2 piece windows which Spartan used from 1950-1955. A photo of a one piece and 2 piece window have been posted here to help you identify your windows.