I think i know the ones your talking about.
You'll need to provide your own o-ring, but if your careful removing/installing your should be able to get away with reusing the original one.
Check clearances between the bar and the space tube, as you are likely to also need an appropriately sized washer.
When fitting them, place some plastic around it before putting your tool on it, as the anodizing is more like spray on paint and comes off waaay to easily.
Other than those items, functionality can't complain, it works as intended and construction is solid for the purpose.
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