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I would imagine that these are fairly large heims?
I don't think that you can get heims with seals when they are that large - a fairly regular inspection schedule is what is called for, looking for increased play between the ball and the race.
Check with any of the heim manufacturers - Aurora, Baker, NMB, etc. for heims in your size that have seals....
I prefer heims without seals - blow with compressed air to clean.
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