Based on my experience with my power steering pump, I would take it to a hyraulic place. Your pump looks like a contract Eaton pump. NAPA will not have the gaskets and their stock on o-ring sizes is limited in my opinion AND they have no good way to measure the old seals (o-rings). The hydraulics place will be able to get you the correct size o-rings AND the correct material. I think the most common o-ring material is nitrile, which is what NAPA will supply and I don't know how the Hyran fluid racts to it or if you will need Viton seals, the hydraulics place will know.