IIRC there are two 'O'-rings that seal the cover to the body. A large one and a small one. The large one is available from almost anyone. I would think you could match the small one from an 'O'-ring assortment. Unless you have insufficient oil pressure, I can't see replacing the entire pump if a couple 'O'-rings will do the trick. I can't say this for sure but if you still have a burning desire to replace the pump, I think the only vendor left is Melling.