Caterpillar, D6D, Radiator Core (A-6684, 7N4384, 7N3542, 1P7752, 225874) 34 3/4 x 31 1/4 x 4 7/16, 6 row Z core, Steel, 9 FPI, Headers: 6 9/16 x 33 1/8, 36 Bolt Holes, Gaskets 1P-6434 x 1, 6N-4950 x 1, 2P-7326 x 1,6N-4952 x 1, 6N-4955 x 2