Belmor Stainless Bug Screen and Winterfront Hardware Kits for your 1986-2007 Peterbilt 357, 375, 377, 378, 379 are made from highest quality, OE grade materials. Bug Screens protect grilles and radiators from bugs and small road debris, while Winterfronts help to maintain optimum engine operating temperatures in extreme cold conditions. These Hardware Kits make it easy for you to quickly transition from the Summer Bug Screen to the Winterfront grille cover. Backed by a limited lifetime warranty and is made in the U.S.A.