67 ram style power steering question

[67pro-street]

i have te original type of power steering that was put on 67 trucks with the hydraulic ram. my question is 1) is there any parts stores or vendors who sell the lines that run from the pump to the unit and if not then 2) which hole on the unit would be for the pressure line and which hole would be the return line. there is one large hole and one small hole. thanks 67pro-street