This aluminum and plastic tank radiator w/ crankbox opening and oil cooler fits Freightliner M2 and Sterling L7500/L8500 models from 2008, 2009, 2010, 2011, & 2012. The core size is 33 1/4" x 38 7/8" x 2." The crankbox opening is 7" x 7" centered on the bottom header.