CAT 306 Mini Hydraulic Excavator Windshield: UPPER & LOWER Replaces CAT Glass (Upper) #496-1130 & (Lower) #496-1131. Please make sure this is the correct glass number for your machine before ordering!  Both Upper & Lower are curved just like the original glass. Models: 304, 305, 305.5 306, 306.5, 307.5, 308, 308.5, 309, CR 305, CR 310: Please reference glass numbers when ordering. Offered in 1/4", 3/8" & 1/2" CLEAR POLYCARBONATE - SUPERCOAT™ BOTH SIDES. Lead times, install videos & more in description!