Radiator Hose, Upper. PART NO: A-70256331. New upper radiator hose with an inside diameter of 1.75" on the smaller side and 2.125" on the larger side. This radiator hose fits the Allis-Chalmers Tractor 200. Dim A (1)A - 1.750" Dim B (2)B - 2.125". . MODELS: Allis-Chalmers TRACTOR: 200.