Hi, I have two power steering pumps that leak around the large 0-Ring (6" diameter). Can someone tell me if the correct 0-Ring is readily available and if there are some hints to sealing up these pumps? I tried a generic 0-Ring replacement with some generic gasket sealer and I had still got drip, drip, drip....... Thanks in advance! Mark Lindahl '63 Chrysler 300 Conv.