Link-Belt Excavator X4 series: Upper and Lower Replaces Link-Belt Excavator Windshield Glass #KHN25620 - #KHN25610 Offered in 1/4", 3/8" & 1/2" CLEAR POLYCARBONATE - SUPERCOAT™ BOTH SIDES. Lead time: Upper: 45-60 business days. Please call our office line for more information. (765)342-2300 Lower: 25-30 days - Made to order. To buy both upper and lower windows, add one window to your cart then add the second as a separate purchase. Not sure what thickness to get? Click here for info.