C.R. LAURENCE TSW850S CRL Duo-Vent Four Panel Slider with Solar Glass for 1988-1992 GMC/Chevy RV Truck "Original" Four-Panel Design Gives the Widest Possible Opening Fully Contoured Powder-Coated Aluminum Frame with Narrow Stiles and Tight-Sealing Weatherstrip Installation Requires a Gasket Frame Measurements: Width 62-3/4" (1.59 m); Height 14-1/2" (368 mm) Daylight dimensions when fully open: 19-3/8" x 12" (492 x 305 mm)