I found manufactures of the fitting in China, the fitting does exist but it is a crimp/swag fitting only. Mine is definitely the nonstandard L18 fitting on the tank. Time to cobble something together it seems.
Does anyone know where to find a fitting for the hydraulic tank return? I originally thought it was an DIN L18 but it appears the threads measure out to ~27mm and not the 26.5mm that the spec calls out for. Needless to say, the the female L18 will not thread on. I am trying to add some...