This aluminum and plastic radiator does NOT have an oil cooler or transmission cooler. It fits 2004, 2005, 2006 and 2007 Chevrolet GMC C4500 thru C5500 Series Topkick / Kodiak. The core size is 37 1/8" x 23 1/4" x 1 7/8." ***Please verify core size dimensions as some trucks have a smaller radiator.*** If smaller radiator is needed, see Ace part #49274P or #49274C.