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I don't claim to be an expert on the matter, but just physically looking at the parts, the Spoon rigid collars may still contribute some benefits as the Whiteline inserts don't fill the void where the bolts go into the sub-frame; it only fills the surrounding area. Otherwise, Revolution could have left their inserts empty in the centre too and save some material/cost.
Revolution seems to basically have the insert and rigid collar in one solid piece of metal. If the Whiteline and Spoon combo works, it would be like the Revolution pieces, but should have less NVH.
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