Radiator Core (SN: 226402 > ). PART NO: A-AC1120R. Our new radiator core is designed and built to precise dimensional specifications to ensure an exact fit. Each core is made of copper fins and a brass lockseam tube. The radiator core has 7 fins per inch and 4 rows of tubes. It is 18.7" tall, 18.5" wide, and has a plate width of 5.813". This radiator core fits the John Deere Tractor GP (SN 226402 > ). (NOTE: Replaces C1940R) Replaces C1940R Dim A (1)A: 18.70" Core Height Dim B (2)B: 18.50" Core Width Dim C (3)C: 5.813" Plate Width Dim D (4)4 Rows of Tubes Dim E (5)7 Fins per Inch. . MODELS: John Deere TRACTOR: GP (SN: 226402 > ).