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To ensure absolute precision and to bridge any issues of engineering tolerance's, Trampa has released 2 types of plastic bushing to make the king pin fit as accurately as it should..... One bushing has a base of 2mm whilst the other has a base of 2.5mm. Seeing as each truck has 4 bushings this .5mm difference allows the maker to bridge a maximum of a 2mm tollerance, more than whats measured on the product. Set includes 4 x 2mm bushings 4 x 2.5mm bushing