NEW International Navistar Heater Core OEM 474030C2 2503899C91 Fits Sterling 1977 - 1988 International S Series Limited one-year, unlimited mileage, Nationwide warranty High Quality, 100% Leak Tested Width: 9 3/8"; Height: 7 5/8"; Thickness: 2"; Hose Size: 3/4" & 5/8" Fast & FREE shipping!