For Datsun 510 Full Aluminum 2-Row Racing Radiator - SRL311/SR/521 PICKUP 1.6 l4 Constructed of High Quality T-6061 Aluminum Construction. High Performance JDM Spec. 2-Row Racing Design Light Weight Direct Bolt-On OEM Fitment or Replacement. Stronger & Higher Capacity for Coolant than Stock Units Highly Increase Cooling Performance Overall Size: 21.75 x 15.25 x 2.00 Inch. Core Size: 19.25 x 10.50 x 1.75 Inch Inlet/Outlet Diameter: 1.25" / 1.25"