TimberPro 725C - 745C, 830C and 840C Polycarbonate WindowsAbrasion resistant polycarbonate window for Timberpro 725C 745C. Front window is available in 1 2" and 1 1 4", depending on what type of head it is using. You should never replace a window with a thinner window, and you should always follow the manufacturer's recommendation when it comes to the thickness of windows in your machine. Window is available in tint or clear. Check your dimensions with ours listed below (tallest and widest measurements).