Innovative engineering, manufacturing technology and quality control ensure that Spectra Premium radiators meet or exceed the performance of the original equipment radiators they replace. That extends to all components, including engine and transmission. The complete radiator offers maximum cooling efficiency. No modifications required for proper fit. These units are engineered to last and a perfect fit guarantee. The Inlet header dimensions are 18-7/16 x 3-1/8 inches. The Outlet header 18-7/16 x 3-1/8 inches.