This aluminum and plastic radiator has one oil cooler on the left (driver's side) tank. It also has a heater return line and vent tube. This radiator also covers applications without a cooler. It fits 2003, 2004, 2005, 2006, & 2007 Chevy and GM Topkick and Kodiak with an 8.1L engine. The core size is 37 1/4" x 23 1/8" x 2."