Power Steering Leak...O-ring?

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06 Mazda 3 Hatchback GT
While I was doing my timing belt/water pump this weekend, I noticed a small leak on my power steering pump, on the top where it attaches with a T27 Torx. I was able to tighten the screw up a bit, but it still appears to be leaking so I am guessing there is a failing o-ring. My question is has anybody been successful in finding the proper o-ring anywhere other than the rebuild kit I see for $20 and up. I thought it would be a pretty common o-ring, but I wanted to check before I took the old one out.


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