CRL Duo-Vent Four Panel Slider with Light Gray Glass for 1973-1996 Ford F-Series and 1997-1998 Ford F-250/F-350 Heavy Duty Cabs by CR Laurence &quot;Original&quot; Four-Panel Design Gives the Widest Possible Opening Fully Contoured Powder-Coated Aluminum Frame with Narrow Stiles and Tight-Sealing Weatherstrip Some Models Available in Up to Four Glass Colors