In thread Front Hyd Pump, http://www.acmocbb.org/ACMOC_BB/show...light=ARC+5016 post #2 carlsharp lists the part number for this oddball chain as ARC 5016 but does not mention the source.
Does anyone know of the source for this coupling chain?
The splined shaft is firmly rusted into the coupling half at he pump and engine. The chain at the pump end has been sitting in water for a while and could tolerate replacement. The standard 50-2 double strand chain will not fit between the outside of the radiator and the pump housing without machining on the coupling.