As said, depends what particular Escort, but all need the "rubber" fitting to the screen before being laid into the vehicle.

Mk1 + 2 Escorts are what we call "Etch-in" screens : The rubber trim is left on the vehicle, with only a rubber strip removed from it. THe screen is then fitted to the car, lipping the rubber trim around it. Then the rubber strip is re-fitted to the rubber trim, and it's width is what tretches the rubber trim tight to hold the screen in place.

The mk3 and mk4 Escorts are what we cann "string-in" screens. The techincal name is "indirect-glazing". This means that the screen is held in place using the rubber trim. You remove the rubber time from the vehicle, fit it around the windscreen and then, using a length of thick string (hence the name) or thin rope, you "string it" back into the vechicle.

The mk5 onwards Escorts are bonded screens and are called "direct glazed" screens. This means that an adhesive bond line is applied to the aperture of the car (or screen) before being laid into the car, and it s the bond that keeps the windscreen in. These screens require the rubber trim (a "goalpost trim" that only goes across the top and down the sides of the screen) be fitted to the glass first, then the adhesive bond is applied to the cars aperture (or to the screen directly) then the screen and trim are laid in as one. The scuttle panel is then fitted last, covering the bottom of the screen.