Cab Skirts For Mack GU813 models. Plain, with block heater cutout. Add to wishlist Part # : 3281-MSS182 Categories: Cab Skirts, Mack Tags: class 8, deiters, Dieter's, dieter's truck accessories ❮ ❯ Product Information Product Information Cab skirts designed for GU813 models 2008+. There is a block heater cutout. Attaches using supplied hardware. Only available plain and includes a removable panel for battery box access.