International Heater Core. Heater Core Fits International 77-88 S Series 1991-1994 8100 474030C2 2503899C91. International Pro Star Heater Core Lone Star 2007-2011 OE Part# 3599598C1. Western Star Heater Core Fits 4900 6900 Series OEM#'s RD119650 N83315605.
