Side Windows

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There are several versions of side windows in the GMC.

Later windows were made by Hehr, an RV window company that continues in business today.

Glass was PPG Sunshade Herculite, in a 50 percent transmissivity. A 35% ceramic film will result in a total transmissivity of 17.5%. Rejection of the sun's heat can be improved by using a ceramic film; these perform best for blocking heat-producing UV rays.