During the 1947-55 series, the five window cab often referred to as the Deluxe cab, was available as an extra cost option.
Their two corner windows helped in visibility especially when backing. Cabs made during the same year are identical except for these corner window options. Some buyers in the southern states rejected this option. They felt the corner windows made the cab interior much hotter during the summer months.
Beginning in 1953, tinted windows became a factory option. Though today’s glass shops can easily add replacement tinted windows to most of the cab, it is as it can be cut from sheets of flat glass. The corner glass that must be found at specialized suppliers have connections with a manufacturer. These tinted corners have recently been made available!