If you have a DRY SUMP LS3 Grand Sport, this is the radiator you need when installing the A&A Corvette Supercharger kit.  This has the built in engine oil cooler.

DeWitts Pro-Series Radiators

DeWitts Pro-Series direct-fit aluminum radiators provide a 25 percent increase in cooling performance. They include features like two rows of one-inch wide cooling tubes, press-formed end tanks, serpentine fins, and factory-type upper and lower channels—and they're epoxy-free! Each radiator core is assembled and brazed in a state-of-the-art aluminum brazing furnace. DeWitts Direct Fit is the company's official trademark, and it means your radiator will fit without modifications.