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I think you could get away with replacing the worst one and polishing out the others.
I used a small whetstone and oil on mine and was able to get rid of 99% of the rust.
It's a judgement call on the pitting. I chose to reinstall all of my pistons, with very minor pitting and haven't had a problem.
But I'm a cheapskate. I'm sure others will advise to replace no matter what.
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