Where did you get them from Trif? the od of the bushes should be 29.0mm and the internal of the bush tube 28.5mm. You are correct the bushes should be a tight fit so that they turn around the crush tube and not spin inside the steel tube. Not sure about gluing them in though, maybe get the wishbones powder coated to reduce the id of the tubes. You may have to chamfer the edge of the poly bush slightly to push them in after, but this is fine.
Andrew
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