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These Miata Sway bars are sold for more money through Mazda as the "MazdaSpeed" Sway bars...but it's the same product MADE BY EIBACH. Kit includes front bar and urethane bushings. The front bar diameter is 25.4mm, hollow. All our Mazda MX5 Sway Bars come with easy-to-read instructions and a lifetime warranty against breakage.