One word of caution, and i've re-used many, many oil pump pickup tubes in a lot of engines. Once the pickup tube is inserted into the oil pump body originally, the OD of the tube has often lost its ability to fit tightly inside a pump body once its been removed and again is reinstalled in another pump. All press-in style pickup tubes such as these should always be welded into the pump body anyway, but definately when trying to re-purpose a used pickup tube. A special tool is also required to install the tube, but this is no assurance it is secure enough to hold itself in place. It also can suck air around the area where it fits into the pump body, so its a good idea to fully weld around the entire diameter of the tube where it meets the pump body.
Even on pickup tubes that have tabs that bolt thru main cap bolts, with time and age, they often become brittle as well and can break off where they are spot welded to the tube and fall off into the pan.
