Our Glass supplier has scoured the world for a glass manufacturer supplying a good quality glass rear screen with no success. 

We sometimes have second hand glass otherwise Revington TR recommends a Flexiglass backlight screen, made from a high specification acrylic sheet, as used on helicopter windscreens. When fitted this backlight screen looks as good as new glass, but has a better light transmission factor than glass. Order RTR7123SW. See below.