These windows were designed after the original soft window from 1966. They feature a fixed vent window and a zip open main window. They are sold in sets and include a steel channel, which inserts into the window opening of a hard door. You will need to drill holes and bolt the feet of the channel to the door. The soft window slides into the two holes in the channel. The window set runs $385.
We recommend keeping the steel tubing greased for easier removal and insertion of the windows.